1. The problem statement, all variables and given/known data Solve for indefinite integral of (7x^3)/sqr(4+x^2)(dx) 2. Relevant equations I just can't seem to find the right solution. 3. The attempt at a solution First of all, we can just factor the 7 out of the integral for now since it is only a constant. the inverse square root of (4+x^2) looks like arctan(x/2). So I set 1/(4+x^2) up as dv, and so V would equal arctan(x/2). U is then x^3, and du is 3x^2. However, the integrals just don't seem to simplify. Please help.