### Product Rule Test Question on TI89

**Find y**

y=(3x-2)(5x^3-x^2+1)

### Raw Transcript

Hello this is Tom from every step

calculus dot com wanna show you how my programs work with the product rule

for Calc 1 and how easy it is,

how sure it is, and let’s get started

have to put index eight into the entry line here to get to my menu which you’re

instructed to do in my instructions

press ENTER here we’re already at the product rule

you see quadratic formula quotient rule all kinds of things you can choose from my

menu

you go up and down my menu whatever with the cursor

here we’re going to choose product rule product rule

any any two functions separated by a times sign

is the product rule for differentiation

and if it had a division sign in there you’d be doing the quotient rule

so you have to know some things about calculus and have to remember

certain things and that’s wonderful so keep that in mind is very important you

write all this down on your paper

you don’t write the formula, the word formula, the product rule you write

these

down on your paper to remind you as you would during a test or whatever

homework

what you’re doing and

then we’re going to enter our function you have to press alpha before you enter

anything into my entry lines here in my programs you

pressed alpha, we’re going to put the quote here you have to do an example of what it is,

it has to be in parentheses

with the times sign in between first parentheses we’re going to put the function in

of this test problem, this is an actual test problem from some person who didn’t get

do very well on the test he would have gotten certainly five points on this

problem if he did it correct

and points are essential being that

calculus testers score on partial credit and the class curve

so we put the left parenthesis

in there and we put 3 times

X minus

2, close off the parenthesis, put the times sign in there

put the left parenthesis in the next function g of x, which is

zero

times x

minus X

squared plus 1

close off the parentheses I always show you what you’ve entered

make sure you entered it correct, if you didn’t you can change it

I say it’s okay

f(x) 3x -2 g(x) is 5x cubed minus

x squared plus one write this on your paper and

you’re working out the formula just like this

exactly like that all this

on your paper exactly but the answer you can if you want

here’s exact answer pretty neat huh? every step

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