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absolute values

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absolute values

by sam117 » Tue Mar 13, 2012 12:09 pm
Hi, this is a question about absolute values. It is written in a Manhattan GMAT guide that |x|= square root of x^2 . But, for instance, square root of (-5)^(2) = [(-5)^2]^(1/2) = (-5)^(2 x 1/2) = (-5)^(1) = -5 ,can someone please tell me where is my mistake.
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by vikram4689 » Tue Mar 13, 2012 4:26 pm
you are not incorrect. |x| means -ve or +ve, you found only one of the ans.

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by sam117 » Wed Mar 14, 2012 3:31 am
An absolute value is always positive. |-5| = 5
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