How do I find the definite integral of 1 / (x^1/2 + 2x + x^3/2) dx, with upper limit of 4 and lower limit of 0? The hint says that I need to factor out the denominator, with which I got x^1/2 times (1 + 2x^1/2 + x). What do I do from here, and would u/du substitution be the best way? Thanks!