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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

    Pyrrhus

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    Homework Helper

    Try

    [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.
     
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