Hi, I've got an integration question I need to answer as part of a assignment and I'm really having trouble making any sort of start on it. I'm not just looking for the answer, I'm hoping to be able to understand how it's reached. From what I've read so far, I think I'm supposed to be integrating by parts and finding an appropriate value for u, but that's about all I can work out so far. The question is:

Find

$\displaystyle

\int \frac{x^3}{(x + 1)^2} dx

$