# Basic Integral Question

1. Apr 24, 2008

### undrcvrbro

1. The problem statement, all variables and given/known data
Find the indefinite integral using substitution:
$$\int$$e^2x(1+e^2x)^3 dx
2. Relevant equations

3. The attempt at a solution
I'm not sure how to start. What do I substitute? Any suggestions to get me started will be greatly appreciated.

2. Apr 24, 2008

### m_s_a

put u=e^2x====>du=2e^2xdx

3. Apr 24, 2008

### Dick

Better to put u=(1+e^(2x)).

4. Apr 25, 2008

### undrcvrbro

Yes, thanks dick. Thats what I ended up doing. I had just learned this stuff today, so I think msa's approach may have been a bit over my head.