One question on my assignment has me stumped. I've tried a number of different methods, but every time, I either get stuck somewhere, or the equation quickly gets ridiculously out of hand. I'm not sure where to start here.

$\displaystyle \int \frac {x^2}{\sqrt[]{2x^2+4x+25}}dx$

I've used google and some math help sites to try to point myself in the right direction, but it hasn't been much help. I'm getting answers like this;

Which both seem very wrong, and don't help at all.

Can someone give me some advice?