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: Help with Integral

  1. Aug 21, 2005 #1
    [tex] \int \frac{\(x+9}{x^2+9} dx [/tex]

    I am not sure where to start. I have a feeling that I need to subsitute twice, but I just don't know what to use first. Any help is appreciated.
  2. jcsd
  3. Aug 21, 2005 #2


    User Avatar
    Homework Helper


    [tex] \int \frac{x dx}{x^{2}+9} + 9 \int \frac{dx}{x^{2}+9} [/tex]
  4. Aug 21, 2005 #3
    Wow, that changes everything, ln and tan inverse I think just looking at it, let me try this, I can't believe I overlooked that.
  5. Aug 21, 2005 #4
    Yea, I solved it, thank you for the help.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook