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Math Help - √u^2 =u for any number u. True or False?

  1. September 20th 2011, 07:07 AM #1
    naturebuilder
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    √u^2 =u for any number u. True or False?

    √u^2 =u for any number u. True or False?

    i think it's true...
    Last edited by mr fantastic; September 20th 2011 at 08:30 PM. Reason: Copied title into main body of post.
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  2. September 20th 2011, 07:14 AM #2
    Plato
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    Re: √u^2 =u for any number u. True or False?

    Quote Originally Posted by naturebuilder View Post
    i think it's true...
    It is false: \sqrt{(-2)^2}\ne -2~.
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  3. September 20th 2011, 12:19 PM #3
    psolaki
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    Re: √u^2 =u for any number u. True or False?

    Quote Originally Posted by naturebuilder View Post
    i think it's true...

    \sqrt{(u)^2}= |u|
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