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: Done by parts integral and simplify

  1. Feb 3, 2005 #1
    i have to integrate the next:

    (x^2)(e^x)dx/((x+2)^2)

    It should be done by parts.
    How I can simplify it?

    Is (4x+4) (e^x) dx/(x+2)^2 easier to be integrated?
     
  2. jcsd
  3. Feb 3, 2005 #2
    the easiest way to do this is by parts.
    let u=(x^2)(e^x)
    let dv = 1/(x+2)^2

    get du by differentiating u by x
    get v by integrating dv in terms of x

    then write out u*v - integral(v*du)
    the integral simplifies pretty nicely.
     
  4. Feb 3, 2005 #3
    Thank You a lot!
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook