Hey,

I have this question:

$\displaystyle \int \frac{x}{\sqrt{3-x}}$

My book says to use the substition $\displaystyle u^2 = 3-x$

Using that substition i get a du that is some utter rubbish and couldn't help in solving this.

If i use u = 3-x instead i get an answer but it's still wildly different from the books.

How could i use the u^2 substitution?

Thanks