gmat prep question

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by 4meonly » Tue Sep 30, 2008 7:15 am
because under square root you can have only positive number and is x<0,
-x*mod(x) wiil yield a posive number, here -x

try it with -5, you'll get 5

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by stop@800 » Tue Sep 30, 2008 9:18 am
4meonly has given good solution.

An alternate would be take x = -y
and solve for y
and at end replace with x

HTH