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Square Root and Absolute Value

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Square Root and Absolute Value

by relaxin99 » Thu Feb 12, 2009 2:19 pm
x < 0 ; square root of -x(abs value x)?

A) -X
B) -1
C) 1
D) X
E) square root X

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by awesomeusername » Thu Feb 12, 2009 2:34 pm
X is negative.

SQRT(-X*abs(X))

Say X=-1

Then SQRT(-(-1)*abs(-1)) = SQRT(1*1) = 1.

Say X=-2

Then SQRT(-(-2)*abs(-2)) = SQRT(2*2) = 2

Thus -X seems to be the answer of choice.