Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Basic Integral Question

  1. Apr 24, 2008 #1
    1. The problem statement, all variables and given/known data
    Find the indefinite integral using substitution:
    [tex]\int[/tex]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. jcsd
  3. Apr 24, 2008 #2
    put u=e^2x====>du=2e^2xdx
  4. Apr 24, 2008 #3


    User Avatar
    Science Advisor
    Homework Helper

    Better to put u=(1+e^(2x)).
  5. Apr 25, 2008 #4
    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook