# A basic differentiation question

Discussion in 'Math' started by jaygatsby, Mar 19, 2012.

1. ### jaygatsby Thread Starter New Member

Nov 23, 2011
184
23
I have this function: g(x) = (x^2-2x)e^x

I attempted to differentiate using the product rule: (x^2-2x)e^x + e^x(2x-2). I don't think that this is right. I used the differentiation function on my TI-89 calculator and the calculator thinks the derivative of g(x) is (x^2-2)e^x

I'm likely misunderstanding some simple concept! Any suggestions?

Thank you

2. ### mrmount Active Member

Dec 5, 2007
59
7
Expand (write out the terms and simplify)the term that you calculated. The (e^x)2x term will cancel out. You will get the same result as the calculator.

jaygatsby likes this.
3. ### panic mode AAC Fanatic!

Oct 10, 2011
1,774
539
that answer is correct and same as what you got from calculator, it is just that calculator combined the terms.

jaygatsby likes this.
4. ### mateenyasin1 New Member

Mar 20, 2012
6
0
calculator simplified the results!