# Need help with this derivative

• Oct 10th 2013, 08:42 PM
rhcprule3
Need help with this derivative
I really am having an EXTREMELY tough time wrapping my head around the chain rule... i have the problem (-3x^2-4)^4(8x^2+4)^-8
Here is what I did
4(-3x^2-4)^3(-6x)(8x^2+4)^-8 + (-3x^2-4)^4(-8)(8x^2+4)^-9(16x)
=-24x(-3x^2-4)^3(8x^2+4)^-8 - 128x(3x^2-4)^4(8x^2+4)^-9
and thats all i got and i dont know what to do next
• Oct 10th 2013, 08:54 PM
SlipEternal
Re: Need help with this derivative
that's it. that is the right answer
• Oct 10th 2013, 09:54 PM
ibdutt
Re: Need help with this derivative
we could simplify a bit as indicated. Attachment 29442
• Oct 11th 2013, 03:06 AM
rhcprule3
Re: Need help with this derivative
So how would I go about simpifying it more?
• Oct 11th 2013, 05:34 AM
SlipEternal
Re: Need help with this derivative
What do you mean? Have you taken algebra? Use what you learned in algebra to simplify the expression. You can attempt to factor the numerator and denominator. Cancel any factors that you can.