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Senior Manager
Senior Manager
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Joined: 12 Mar 2009
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GMAt Q [#permalink] New post 20 Jun 2009, 02:23
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A
B
C
D
E

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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Director
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Joined: 04 Jan 2008
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Re: GMAt Q [#permalink] New post 20 Jun 2009, 04:17
If x<0, then root of [-x | x |] is

-x
-1
1
x
root(x)


now Root and Modulus of anything is +ve

hence final result is +ve

x is negative hence its A
plug some values like -4,-2 and check yrself :)
_________________

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Manager
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Re: GMAt Q [#permalink] New post 21 Jun 2009, 00:57
Sqrt(-X * |X|).............................1
Given that X< 0 so |X| = -X
So eq. 1 becomes
Sqrt(-X * -X) = Sqrt(X*X) = |X|.........2
Since its given that X<0 so eq. 2 tells us that |X| is -X.
Re: GMAt Q   [#permalink] 21 Jun 2009, 00:57
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