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g.matter
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GMATPREP PS 20 Dec 2006, 18:28
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GMATPREP PS 20 Dec 2006, 19:31
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-x

Say x = -a
sqrt(-(-a)|-a|) = sqrt(a*a) = sqrt(a^2) = a = -x
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mm007
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GMATPREP PS 20 Dec 2006, 19:52
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hey, it is a huge download...

anindyat, u r not considering the possibility of -a as a solution.. both -a and a can be solution..

i think the answer can be either -x or x...
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anindyat
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GMATPREP PS 20 Dec 2006, 20:58
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Take a case when we do not know the value of x
x = sqrt (4) => x = +-2 , x could be positive or negative

If we know x > 0, and x = sqrt (4) => x = +2 in this case we ignore the negative value

Here in this question x < 0.
I am deliberately choosing x = -a to enforce the value of x to be negative. which can be done only when a is my absolute positive value, which can not negative.

Like x = -16 if we write x = -a, then a can not be negative, it has to be +16
So in my argument a > 0
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GMATPREP PS 20 Dec 2006, 23:26
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Infact the argument is asking the value of an expression.. not the value of x or a, for that matter..

something wrong about the question.. !!



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