
simplifying
i am very confused on this, how do you get 36(x^2 1)/(x^2 + 3)^3 from simplifying the top?
i divided the numerator and denominators and got 12 + 48x^2 /(x^2+3) which is different from the answer; can someone please explain it clearly
http://img131.imageshack.us/img131/7615/65483323rj0.jpg

If you divide the top and the bottom by $\displaystyle *x^2 +3 $*then you get
$\displaystyle \frac{12(x^2+3)+48x^2}{(x^2 +3)^3} \frac{12x^236)+48x^2}{(x^2 +3)^3} = \frac{36(x^21)}{(x^2 +3)^3} $