1. ## Function trouble!

Hey guys!

We've spent the last 5 classes using derivatives to study to graphically represent functions, but there are some functions which seem to give you a headache.

for example : $f(x)=\frac{(4-x)^3}{9(2-x)}$

i found where the function is defined ( $(-\infty , 2)u (2 , +\infty)$),
i found the asimptotes ( it has only a vertical one at $x=2$) , but when I have to find monotony and extreme values I get stuck.
First I find the first derivative, then I have to make it equal to zero and then I'm left with $-3x^3+35x^2-135x+176=0$. how do I find x from here?

It sounds silly, but i'm kinda stuck.

Regards,
Rinor

2. no worries, I got it right!
thnx anyhow