that's it. that is the right answer
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