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Math Help - Limits

  1. #1
    Newbie
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    Apr 2010
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    Limits

    Hey guys! I was out of school due to AP exams and have missed three days of Pre-Calc, I'm just working through a thick packet of makeup work on Limits and Discontinuities right now and have been managing fine until I got to this problem:

    lim (√x^2+9) - 3 / x^2
    x→0

    I know I'm not supposed to just plug in 0 for x, and that I have to do something on the top, but whatever that is, I'm just at a loss.

    Any help will be greatly appreciated!
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  2. #2
    Super Member Random Variable's Avatar
    Joined
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    multiply the numerator and the denominator by  \sqrt{x^{2}+9} +3
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