https://everystepcalculus.com/3338-2/

Trapezoidal Rule Calculator on the TI-89

Video Transcript

Hello welcome back to calculus step-by-step programs. I’m Tom the owner and and inventor of these programs.  When I was, in course calculus… so EveryStepCalculus.com EveryStepPhysics.com.

 By the way go to the, go to the right of this program if you’re watching it and impress that little square box on the right corner here, where you can subscribe you know. Because I need subscription people to be able to edit my program is better, you need a thousand of them and I don’t have that yet.

But anyway, let’s finish entering this function here.  This is X minus 1, close off the parentheses, to the second power. All right looks good.  I’m gonna enter the range alpha, what is it range? f4 to to and alpha 3 looks good . And they wanted over 4 intervals alpha 4.  

Now here’s the trapezoidal rule formula right here.  Notice this guy doesn’t give you that, he says, oh recall that the area of the trap yeah we recall that, uh we got up this morning and knew this formula just like off the top of our heads right there you know.

H height times the base you know,  you’ve got two bases here. I wonder if this is swear words here with the **** here. Use the value of a trapezoidal rule the N equals four approximate that, swear word, the integration is from two to three I don’t know what he did there.

My calculus book is filled with bad language against calculus. Calculus is just a million sudoku puzzles it solves nothing useful. Or crossword puzzles solve nothing useful same thing. So let’s do this one here now you’re gonna study maybe a week on this problem to be able to do this by memory probably then you couldn’t even accomplish it.

That’s the reason I wrote wrote programs for it. Now you’ll be able to do it for the rest of your life if you buy my programs. So change of X is B minus a divided by n okay? There it is, 1/4 write down everything you see on your paper or test because everything is scored on partial credit on calculus and physics. 

Whatever you can put down that is relevant, gives you a couple of points and those points make you better than the rest of the class ok and that’s what you want to get. We’re gonna compute the intervals that N equals four we start, you put this down here just like this XO x1 x2 we equal the a equals the 2.  

Go down just like the list okay? You can imagine the work in programming this problem okay? Replacing the function okay you’re safe okay we’re gonna place F of two and we’re gonna put it into the function here. One divided by the X the quantity X minus 1 squared and figure out what that value is okay?

So we do that for all the values and f it was nine fourths like we found before etc . Trapezoidal approximation is the change of X divided by two times f of a and this right all the way down here. Here’s the end of the brackets. Here look at the numbers we’re getting into here now,  you could do they couldn’t you? You just sit there and rip out these numbers off your calculator just like Newton, no problem . 

And the answer is this divided by this 0.5 over 9 square units you know ? Well you found the area of a trapezoid.  Wow let’s go out and have a beer okay?  Hey go to my site buy my programs.  

If you need help in calculus I’m here, you send me your test study material and I’ll make sure that they work for you. I’ll get right back to you and show you how to work my programs and how to do it and you will pass calculus. And don’t waste any time studying this stuff okay? You have more important things to do in life.  This is worthless stuff, algebra and this is worthless.  

So be smart buy my programs and pass calculus simple as that and you’ll have it for the rest of your life,  if you don’t destroy the calculator somehow.  So anyways have a good one okay?  Don’t forget to subscribe for me,  thank you!

More test and quiz questions solved below

Trapezoidal Rule Calculator Example

Question

Hey Tom, I’m in precalculus and really struggling. I have purchased the college algebra app, equation solver app, and the precalculus app from the ti89 website. They have helped me get this far and are great but they don’t seem to be able to show the steps when the x or y is squared.

I know how to get the answer by looking at the graph but like you said I have to show my useless work. They also seem to have a problem solving problems with ln and e. To answer your question, I just want to pass and move on with my life. Will any of you programs help? Thanks

Answer

My programs were designed by me so I could pass calculus.

In my day the TI-92 was invented (25 years ago) which I was required to purchase to take my Calc 2 semester class. The professor taught us how to use the ti-92 calculator which was invented by Texas Instruments could come up with the answers for derivatives and integrals.

In a Calc test you could use the calculator but if you put down an answer with out showing the steps you failed the problem. It had a word processing function which I discovered and I was struggling and hated calculus at the time so I scanned a problem with the steps in my notes from the professors black board explanation into the ti-92 and used the “word find” to access different problems to try and solve them in a test. 

The problem was that it was slow, like having an open book test, you had to find the problem then read it and understand it to be able to solve the test problem with different variables.

So to solve that, I discovered that you could program the calculator and I was absolutely thrilled. I placed variables in different memory slots and used them in a million math functions that was available in the calculator and my fabulous programs were invented.

I got A’s in not only the calculus classes, but electronic classes and physics classes, which I programmed for also. The ti-89 calculator came out and I programmed away.

Now to answer your problem, what class are you in that requires this, calculus or algebra?

“Non linear equation” doesn’t register as being this problem, but who knows what your crazy professor came up with now days.

To solve a two variable equation you need two equations
You solve one equation, isolating the x or y value, and place that into the other equation and then solve that.

That takes knowledge of algebra, and anyone, including me, would need to write the steps down on a piece of paper to do this.

Now the big question, Is your goal to learn algebra, or learn how to actually solve this particular problem step by step?

Or like me, know how to solve it, but would like it programmed to quickly be able to write the useless answer on a test problem 
and get on with more difficult ones? 

More PreCalculus help? Take a look at this video solving a test question

:: Full Video Transcript ::

Tom from Every Step Calculus EveryStepPhysics.com we’re going to do a point slope form problem with two points that are given. And index8() to get to my menu. Choose point-slope equation and we’re going to choose number 1, 2 points are given. Press alpha before you enter anything, Use alpha line in these lines here when you enter any problem in my…enter the information in a problem that i’ve programmed. alpha 8 for x, 1 point alpha minus three for the y value. For the other point alpha five and alpha minus nine. I always show you what you’ve entered, you can change it if you want I say it’s okay. And we find the slope M by using this formula here. The answer is two and we find b line crosses that V is the line that crosses the y-axis y minus M times X 1 is minus 19 so the equation of a line y equals MX plus B it’s 2x plus minus 19 pretty neat huh everystepcalculus.com go to my site buy my programs and get through calculus somehow have a good one.

:: Transcript ::

Hello, Tom from Every Step Calculus Every Step Physics .com. This is a problem submitted by a student. How do you evaluate this line integral? A line integral the original formula is the integral of a function times d R which is the derivative of the RT function here and then C is the what the parameters are going through which in this case is a curve. Trying to find the integral of this curve here. index(8) to get to my menu. Scroll down here to line integrals because that’s what they are asking you to do in the problem in your test or whatever, homework. So we’re gonna go down here to line integrals, press Enter . And we’re gonna choose number six I and J because that’s what they give you here, we’re in I and J okay? So you have to get used to that and my programs a little bit. You have to think a little bit in college so I and J we’re gonna choose number six and then in calculus 3 this is an M this might be calculus 2 here because we’re only dealing in XY & IJ parameters not XYZ and ijk parameters. So if it’s calculus two then this is an M which which you know tells you that this whole function here is an M and this is an N function before the J ok? So enter the m function term before the I, here’s the term before the I okay? And we’re gonna put that in now you’re gonna press alpha, that’s the only thing you have to do in my program, just press alpha and then you can enter the two times x times y plus one here in the calculator here okay? And then, so we did that, and then the end function here and we’re going to enter that x-squared plus 1 by pressing alpha first and then putting that term into the calculator okay? Now I’ve already done that in the simulator to save time. So you can see that it matches what they’re talking about the calculator always puts the XY term before the consonants you know so switch them around a little bit but no big deal that makes sense to us. And we’re saying it’s okay because you can change it in case you made a mistake in entering it. Our line segments given no they’re not, a segment is XY point, to another XY point, or XYZ point to the number another XYZ point depending upon what they tell you in the problem but no line segments so we’re gonna say no. But they do mention I and J in the in the problem okay so here’s I and J where is it? Here’s I and J we’re gonna say yes to that and we’re gonna enter the term before the i hits which is T okay so we we’d enter alpha t normally alpha t. And then we’re gonna enter the term before the J well here it is over here now this is a tricky problem because sine of PI over 2 is really 1 okay so you can put that in here you can enter sine of PI over 2 times T squared just like it says here but the calculator well we’ll assume that you’re talking about sine of PI over 2 is really 1 so it’s 1 times T squared. So if you enter that it’s just gonna come up with T squared anyways okay so here’s the I and the J that they’ve entered here and now we’re going to put in the range range is zero less or equal than t and then less or equal than one okay? So the lower limit is zero you’d put alpha zero in here and then you put alpha one just in case they gave you something different here. But generally when you parameterize something in a problem like this it’s always 0 to 1 ok? So we say it’s okay so now we start to do the the derivatives etc here’s the X term which is T which is T right here and the derivative of that is one here’s Y as T squared the derivative is 2t DT here’s the original integral and we’re going to put the all these what we found for X&Y; into the problem here which we’ve done I have to use quotation mark so the calculator does that but you’re gonna put parentheses around here like for x put parentheses around for T squared okay and you’re in your paper. Then we of course we multiply it out and condense it and here’s the real which you’ve entered here. And we’re gonna integrate the problem which is here and there you could do that really easy couldn’t you? I couldn’t, but you could over the range of 0 & 1 so we integrated this problem now at t equals 1 we compute it through there and we get seven halves at t equals zero we computing its 1/2 upper – lower always in physics and calculus upper – low which we’ve determined. And the answer is 3 pretty neat huh? everystepcalculus.com go to my site buy my programs are only 40 dollars and you’ll pass calculus and you don’t have to study this stuff hours and hours and hours. I’m pretty good at line integrals right now because I’ve been doing it for three weeks 25 years actually but then cleaning it up here for three weeks for other problems and almost all the problems I can I can find so have a good one, I hope you pass calculus!

:: transcript ::

Hello Tom from EveryStepCalculus.com, EveryStepPhysics.com. A line integral problem again. I’m going to do this until I get done with the formulas that I’ve found so that you can do all these on your tests or whatever might come up on your test or homework . My programs are one-of-a-kind and the only one that does it. I’m not the only one they could do it but I’m the only one that does do it because I was into calculus at one time and then of course into programming which I like. Anyways you can go to my site buy my program for $40 and they’ll have you pass calculus, simple as that. And calculus I have determined is a worthless math concept, it doesn’t solve anything as far as I’m concerned. It can’t solve anything because it always comes up with one single number. It doesn’t come up with formulas or wild things that you can solve cancer with, or help with physical fitness and which they all say it does you know. But they’re just completely uninformed and and they don’t do this calculus as much as I do it. But anyways, index(8) to get to my menu, here’s a problem right off a test. Get to my main menu we’re gonna scroll down here I’m just gonna hold down on the cursor here to scroll down to the L section verse as line integrals. And choose that because that’s the subject we’re talking about. And here’s line integrals and we’re gonna do this, notice that these are all the possible test entries for line integrals, in other words you got dx dy, dx dy dz, function (x,y) a function of (x,y,z), and i j, and i j k and x equals okay? That’s what’s gonna be on any test you might take one of those. You have to choose which one. Now this one would be X Y Z they’ve left off the Y in here somewhere but you’ve got a Z here so you’re gonna choose, you certainly couldn’t do X Y. Choose number for X Y you’d have to choose number 5 X Y Z. So I’m going to press the number and scroll down or press the number. I’m gonna enter the function, now you’re gonna press alpha and enter this function here which is x squared times Z okay? Alpha X squared times z. Now I’ve already entered this in the these all these variables I’m not going to do each variable because I just wanted to show you how do you enter the variables in here. And, um, but I’ve entered them in here for speed you know. Now was given here as points you see points here? You know there’s segments that’s for sure they’re going from this point to this point, that’s a segment. So we choose points in my next menu and we’re going to X Y Z to X Y Z here’s X Y Z to X Y Z okay? So we’re going to choose that. I can’t put X 1 and X 2 etc because of the width of this screen here so I can, I have to keep it within the constraints of this area here. So you have to get used to my programs a little bit, try them out. Press number 3 and we’re gonna go quickly through entering these now you’d press alpha and put each one of these in. alpha 0 alpha 6l so alpha minus 1 and I show you what you’ve entered you can change it if you want I say it’s okay. And we’re gonna parameterize it okay? So and this is the formula, don’t let any professor tell you any different this is 1 minus T times the X 1 plus X 2 times T okay? That’s it, now you get all kinds of professors that throw this stuff around and these are the tough things you don’t know what they’re talking about, what they do, and they think it’s simple they’ve been, teaching this crap for years so they just you know throw it around but we have to know the formula and to be able to to make it couldn’t stream which with every other possible thing you know. And here’s y and here’s Z the parametrization of this okay? And when you parameterize the limits are zero the range is 0 to 1. So x equals 40 the derivative of that is 4 y equals 6 minus 5 T times T the derivative is minus 5 etc okay? Do it exactly like this system. ds right over here there’s a DS that equals the magnitude of the of this segment and that’s the derivative of RT which is these here X prime of Y squared and Y prime of square of Z prime of squared ok? 4 minus 5 6 does everything for you write this stuff down don’t even study it it’s not worth studying it’s a waste of time. so it ranges from zero here’s the integral here we were substituting all of those in for x and y here’s X and then of course we have the DS here okay? We bring all constants outside of the integral in calculus okay? If there’s a constant in here we bring it out. We integrate it, of course you could all integrate this like nothing couldn’t you? Of course you could. And then at T equals 1 we enter the T and in for all the t’s in this what we just found in the screen before we come 56 divided by 3 at T equals 0 we enter the zeros for all the t’s now comes 0 we always upper – lower in physics and in calculus 56 and 3-0 answers and then we add the the square root of 77 in your 57 56 you know this answer here okay? Notice that a line integral, notice how stupid everything is because this doesn’t even represent anything. What is this? feet? meters? is it square cube roots what is it? You never know just a bunch of garbage and go to my site buy my programs and pass calculus, believe me it’s the greatest programs ever, have a good one!

:: Transcript ::

Hello Tom from everystepcalculus.com I do these programs for one reason for you to pass a test and and if you’re lucky do some homework, get some homework done. Mainly tests, I get tests from all over and I program from test problems. Test problems have to be relatively simple even though nothing’s simple in calculus because it’s 10-million puzzles like Sudoku or crossword puzzles. That’s all it is, it never solved anything at NASA, never solved anything in life worth anything in my opinion. After 25 years of studying this stuff any more than multiplying two numbers together can give you the answers for curing cancer or whatever. Look at this problem here we’re dealing with sine waves okay, here’s sine waves, nonsensical adding things together in the functions three-dimensional XY and Z and then all of a sudden somebody decides that you’re going to have a time, times you know to the fourth power or minus time to the fifth power of T you know none of this nonsense would ever happen in real life is it just puzzles to see if you can calculate them. Okay well I can calculate them in a program why would I ever try to learn this stuff and memorize it and put it to my fabulous memory if it was such if it’s worthless and I know it’s worthless I’m not gonna memorize that, I’m not gonna study it okay? That’s the reason I created these programs and you can take advantage of them too, you can go to my site buy my program for $40 and pass calculus as simple as that. You don’t have to study this crap okay so anyways index(8) to get to my menu let’s do this problem. This is the problem one I got off at Yahoo one of many now and one thing I do want to teach you but lining it was well I’m gonna press number 7 here because this is what we’re after here, no we’re not after that at all, we’re going after line integrals sorry. I was ahead of myself here I got so upset over calculus. now I’m an expert at line integrals now because I’ve studied it for this program this stuff for well around for the years but really pushed it hard for the last month here. so now line integrals and we’re going to go to line integrals here, press Enter. And this problem is I J and K okay so we’re gonna choose that number seven in the menu I J and K. Now these are all of the possibilities of line integrals that I have found. When they give you a problem, they will give you dxdy you’ll choose that dxdydz the function of under with x and y no Z, function with XY and Z or the function with I and J and I J and K. These are all tricks by professors to screw you up and see if you know everything that they teach they put a simple problem of line integral down the book and the blackboard and then all of a sudden teach this god-awful stuff with sines and cosines and etc how they do this. So anyway is that we’re gonna go to number seven press number seven to get to that in the program. And we’re going to enter the variables now this turns into calculus 3 2 m and and O ok? M and then O so here’s the M 1 know if we’re gonna enter this sine of here we’re gonna press alpha and we’re gonna press sign we’re gonna go to sine which is second and Y there’s sine we’re gonna put the X in there close up close off the parenthesis and press enter okay? Now the n function the same thing you press that you go to here and press alpha and put in the sine cetera et cetera in my program got to press alpha first remember that I’ve already loaded this stuff into the simulator here to make it easy and here’s here’s what they’ve entered right x times Z here’s x times Z here for the K and D are okay the D are shows you there’s an RT function and you’re going to do the derivative of the RT function which equals the dr here okay? So I say it’s okay when you enter these variables and was segments given? No segments is when you get when they give you points a segment going here like in a triangle segment going up and a segment going here etc two segments three signal whatever so there’s no segments given here so we say no okay now is I J and K given yes yes for C okay and so we’re gonna we’re gonna press YES on that and we’re going to enter the T term before the I here’s a here’s the I here’s a before T to the fourth power. Now again you press Alpha and put T to the fourth in there and I’ll do it for you here alpha T to the fourth, there it is right there okay? And we press ENTER now we’ve got that entered there now we’re doing for the other three but I’ve already entered them in here now okay so we have T to the four minus T to the five and then T for K notice this nonsense you know x times the power of the fourth times minus time to the 5th power you know how would that ever read till anything worthless worth anything in this lifetime okay? So I say okay if it’s all good we’re gonna enter the range, range with RT functions is always 0 and 1 so I’ve already entered that to 0 and 1 but if they gave you something different I suppose they could if it’s a puzzle and you you could enter that yourself okay? I say it’s ok, now we have x equals T the 4th here the derivative of that DX is 4 times T cubed okay DT etcetera etcetera you mark this on your paper systematically does this, these computations for you here’s the original integral it’s changed with DX dy and DZ here instead of I J and K because you have to multiply the problem with DX and dy and DZ which we just found in the previous screen we’re gonna substitute all these in for the X&Y; here we do it here no you’re gonna put your gonna put parentheses around these quotation marks because I’ve entered a in in for X and here’s the DX right here’s the Y and here’s the here’s the dy etc and it equal and it’s over the range of 0 and 1 here’s the integral okay? We’re gonna condense it make it clean it up here’s the real integral after we multiply things together we’re going to integrate, try integrating this stuff in a test huh? easy right I don’t think so over the range of 0 and 1 now at t equals 1 you have cosine we’re entering the one for all the t’s and here in the pretend that what we just found and here’s the answer – cosine 1 – sine 1 plus 1 over 6 ok? At t equals zero turns out to be minus one upper minus lower that’s always the case in physics and calculus when you do anything over a range it’s always upper – lower okay and here’s the answer and here’s – – one you probably put down plus one here which would be correct and plus one you know is course six six and then you’d have seven six here but here’s the answer – point two one five okay? Now go into my site buy my program and enjoy passing calculus have a good one!

:: Transcript ::

Hello tom from everystepcalculus.com we’re gonna do a calculus problem here is you see on the screen line integral this is an IJ and K. Once you see that this that’s what you’re going to do. It triggers you to for the menu to choose that okay anyways let’s do it index(8). I’ve already added the parameters and these variables into the into the simulator here so that it can save time when doing that index(8) to get to my main menu. We’re gonna scroll down here to the line integral or in the menu that’s at the alphabetical letter of L of course so we’ll scroll here down and then look for that. Here’s line integrals here we’re gonna press Enter and wait for when it says busy here it’s loading the program only does that the first time you loaded after that it’s very quick and we have IJ and K which is number 7 here you can scroll down like this or you can press the number 7 I like to press the numbers it gets there quicker and it loads the program for this type of problem. You’ll notice that the line integral this is the integral of the function for dr over the range of C and that equals (M)i+(N)j+(0)k here do you write all this on your paper exactly like it says here ok. We’re going to enter the function now normally you’d have to press alpha and then enter the minus 2x I here but I’ve already done that so and then before n2 asks you and before the O it asks you ok and it turns out to be here now here’s minus 2x I which is just like in the problem here plus y + 5 z k dr okay? You can change it if you want i say it’s okay. There’s line segments given no there’s no line segments given here is there okay so we’re gonna say no number 2 to his I J and K mentioned in the problem yes here’s here’s IJ and K here. RT there should be i’s this person didn’t put these in here right there should be i’s after each one I, J and K after these but yes and normally the problem will always have an IJ or K here so you add the I’ve already added them in here you can see it’s sine of T cosine of T i, J and K okay. I say it’s okay we’re gonna enter the range the range is given from zero to three times pi over two notice there’s no x in here this guy doesn’t know what he’s doing or girl whoever put this problem on the internet here and I’ve already added them so we’re going to go from 0 to 3 PI over 2. Say it’s okay. Now we parameterize the whole thing which we take x equals sine of T DX is the cosine of T y etcetera cosine of T dy is minus sine of T etc Z and DZ okay here’s the original integral minus 2 X 2 DX Y dy 5 times Z DZ the reason that dxdydz because we got to add that we’re gonna add that in the problem so we substitute all these into the problem here you notice here’s 2 times X there’s minus 2 times X and X is sine of T so then and then of course the DX is cosine of T and that’s the same thing for the other entrances here you’ll notice the quotation marks and your problem on your sheet you’d put you’d put parentheses around these quotation marks to indicate that you’re substituting it for x y&z; we clean it up here and condense it here’s what you get put this on your paper just as clean as that over the range of 0 and 3 times pi minus and divided by 2 we integrate okay here’s the integration you can do that in your head can’t you but I couldn’t I needed income calculator to do it here’s three times divided by two over that range so we’re adding the 3 PI over 2 to all the T’s in the problem the answer is 45 times PI squared over 8 at t equals zero we had zero for all the t’s in the problem and the answer is three-halves upper minus lower that’s always the way it is upper minus the lower and the answer is 54 you notice I’m pathetic line integrals are because you don’t even know what this is what is 54 mean what 54 square units 54 meters 54 feet what you know but calculus is stupid that way calculus is sudoko of math all right so anyways why would you do this in your brain or try to learn how to do this and memorize it for tests or anything else you can when you have a program like this you buy my programs for 40 bucks and 39 bucks I guess whatever it is and then you load them in your calculator and you can do a million of these including physics so make sure you think about physics too unless you want to just study this stuff for hours and hours and hours like I do I know a line integral is pretty good because I’ve been doing it for what two or three weeks now so now I know everything about line integrals and they’re all a waste of time in calculus but we need them to pass our homework and pass our tests okay you get out of that class move on with our lives so anyways go to my site buy my programs and enjoy passing a calculus okay have a good one

Transcript
Hello, Tom from everystepcalculus.com and everystepphysics.com again. This is a problem that was sent in by a student to Yahoo integrate X times the quantity X squared + 4 to the ½ power. So, let me show you how we do that in my programs okay. Index 8 to get to my menu we’re gonna go on a scroll up to get to U substitution the reason you know it’s U substitution because you take the derivative of what’s inside the parentheses here. Which is 2x and that is almost matching the outside of the problem except for the two you know and so then that’s someone my say that might be U substitution. So, then you go to use substitution in my programs, here we go there and we’re gonna enter the function you have to press alpha first. Alpha X times the quantity X2 plus four close off the parenthesis to the left parentheses, 1 divide by 2 power and you noticed the calculator and I would do anybody in a mathematician would you changed anything to the half power to a square root situation. Until you get into integrating it then you change it back okay so, this is the problem here I wish to give you a chance to change in case you made a mistake but that’s the correct one and we’re waiting for the program to load. So, here’s the problem we’re gonna rewrite it with the X next to the DX okay I like to do that because it keeps you organized as far as what you’re doing with the next step which is the most important one. Remember this one forever this is the one very simple U equals at the inside of the parenthesis okay, the derivative of that is 2X is DX. We take the 2 with algebra and divide it than the other side by ignore size by two with XDX notice this is the same is what we rewrote the problem with okay. So, you can forget about that portion of it now, we have integral of this right here so that’s the same thing as the integral of the square root of U, DU divided by two okay constants come out of the integral course and you do this write this stuff down exactly as what you’re looking at here. Excuse me that is a firetruck coming by and here’s the answer right here. Okay, pretty neat huh everystepcalculus.com go to my site buy my programs are only $40.00 nothing like you’d spend in a bar or a pizza house or out to dinner and yet you have this stuff in your calculator forever able to do all these problems, hundreds of problems in my; in the calculator okay. This is the greatest notebook because when I research a problem why? Why would I just put it on a piece of paper and throw it out you know I program it put it in here I have it for the rest of my life and you will too if you buy my program so keep that in mind and you’ll be able to pass calculus because you’ll get six or seven problems exactly right in any test of calculus compared to the guys or girls sitting next to you and of course the class is scored on partial credit and the class curve. So, that’s the reason that you don’t need to get a hundred percent on every test to get an A or pass the class or test. Hey, have a good one.