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by mjjking » Thu Mar 26, 2009 10:09 am
I really don't get why answer is A ... :(
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by Tryingmybest » Thu Mar 26, 2009 10:28 am
X is negative

when X is negative |x| = -x because output of modulus will always be positive example |-3|= -( -3)


SQT ( -x|x|) = SQT(( -x)(-x))
= SQT( -x ^ 2)
-= -x


Please let me know if this is not clear
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by DanaJ » Thu Mar 26, 2009 10:31 am
Think of it this way: x is negative, right? That makes -x = |x| positive.
This means that sqrt(-x*|x|) = sqrt(|x|^2) = |x| = -x.

RULE: sqrt(n) will always be positive or equal to zero.
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