(adsbygoogle = window.adsbygoogle || []).push({}); 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.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Help with integration (1) involving integration by parts etc

**Physics Forums | Science Articles, Homework Help, Discussion**