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Thread: Stumped

  1. September 9th 2008, 04:16 PM #1
    4kVoX
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    Stumped

    So I skipped over this question after 10 minutes of frustration.
    Help would be really appreciated =).

    Factor:
    X^2 - 20

    thanks.
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  2. September 9th 2008, 04:38 PM #2
    mr fantastic
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    Quote Originally Posted by 4kVoX View Post
    So I skipped over this question after 10 minutes of frustration.
    Help would be really appreciated =).

    Factor:
    X^2 - 20

    thanks.
    Two things:

    1. x^2 - 20 = x^2 - (\sqrt{20})^2.

    2. A^2 - B^2 = (A - B)(A + B).
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