$\displaystyle f(x)= (4x+x^2)/(2+x)^2$

I have to find the second prime derivative.

I got the first one, which resulted in the function in the above, but i have trouble doing the second derivative.

in the start i got....

$\displaystyle f(x)= (4+2x)(2+x)^2 - (4x+x^2)2(2+x)/ (2+x)^4 $

From then on, i don't really know what to do. Can someone lecture me.