# Math Help - Where is my error in this Derivative

1. ## Where is my error in this Derivative

I have done this equation numerous times and i keep getting the same answer. Can someone tell me where my mistake is? I keep getting a negative result and it should be positive. Also in step (6) is that how you get the GCD?

Thank you.

2. ## Re: Where is my error in this Derivative

Uh, no it's not. Your solution is correct.

BTW, in step #3, you ought to indicate which pieces you're going to take the derivative of.

3. ## Re: Where is my error in this Derivative

Hy petenice.

http://www.wolframalpha.com/input/?i=d%2Fdx+%28+%28-3x+-+4%29%2F%28x%2B2%29^%281%2F2%29%29

4. ## Re: Where is my error in this Derivative

Thank you for help guys, i really appreciate it. Thanks for the link chiro, very useful.