Hi

I am having trouble finding the turning point and POI for this function:

$\displaystyle \frac{3x}{(x+8)^2}$

i know that the asymptote is x=-8 and y=0.

x an y intercepts are 0.

this is what i get for the first derivative: $\displaystyle \frac{-3x^2+96x+192}{(x+8)^4}$

This is where i am stuck.

P.S