Sorry about the multitude of questions but I have a midterm on thursday! Woe is me! xD

This U-Sub has caused me some problems, I'm not quite sure how to approach it.

∫xdx/(1+√x)

If I substitute U=1+√x I get 1/2√x so that doesn't help

and if I substitute U=x that of course turns into du=dx

Any advice?