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Math Help - Pythagorean theorem?

  1. #1
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    Pythagorean theorem?

    How much is x?

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  2. #2
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    Quote Originally Posted by Nforce View Post
    How much is x?

    (x - 3)^2 + x^2 = (x + 3)^2.

    Expand, simplify and solve for x.
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  3. #3
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    i know i have to use pythagorean theorem, but i can's solve it. I always get x^2 = 12x
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  4. #4
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    Quote Originally Posted by Nforce View Post
    i know i have to use pythagorean theorem, but i can's solve it. I always get x^2 = 12x
    x^2 - 12x = 0 => x(x - 12) = 0 => x = 0 (rejected) or x = 12.
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  5. #5
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    yes, thanks... i forget that
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