- #26

- 830

- 1

but why? i simplified already

Check your work again.

if

f"(x)=(-2x+(x^(2)+9)(4x^(3)-36x))/(x^(2)-9)^2

(4x^(3)-36x) = 4x(x^2 -9)

f"(x)= 4x(-2x+(x^(2)+9)/(x^(2)-9)

Which I highly doubt considering the numerator is of a higher degree than the denominator.

You answer should look like

k(x)( ax^2 + b) / (x^2 -9)^3 for some integers k,a,b.