√u^2 =u for any number u. True or False? i think it's true...
Last edited by mr fantastic; Sep 20th 2011 at 07:30 PM. Reason: Copied title into main body of post.
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Originally Posted by naturebuilder i think it's true... It is false: $\displaystyle \sqrt{(-2)^2}\ne -2~.$
Originally Posted by naturebuilder i think it's true... $\displaystyle \sqrt{(u)^2}= |u|$
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