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Math Help - Improper Integral problem

  1. #1
    Junior Member
    Joined
    Sep 2009
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    62

    Improper Integral problem

    I can't figure out how exactly to do this. If somebody could show me how to set the limits up, that would be great:

    Problem:



    I need to integrate that, but I've never seen one where both parts of the limits of integration are infinities. Normally I'd use the limit as b approaches infinity from a to b of the integral, but which one is b? I don't get how to start it or set it up.


    Thank you for any help.
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  2. #2
    Senior Member
    Joined
    Jan 2010
    Posts
    354
    You can just think of it like:

    \lim_{k \to \infty} \int_{-k}^k \frac{dz}{z^2+9}
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