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# gmat prep question

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Intern
Joined: 26 Jan 2009
Posts: 23
Schools: University of Toronto, Schulich, Western, Queens

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07 Apr 2009, 21:07
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I'm a little confused when i expand out the question....when i square both sides, it seems like they do equal each other
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Senior Manager
Joined: 08 Jan 2009
Posts: 324

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08 Apr 2009, 06:17
Is (x-3)^1/2 = 3- x
3
for the above equn to hold good 3-x > 0 must be positive or x < 3

Stmt 1 :

X =/ 3 we do know x< 3 or X > 3. Not sufficient

Stmt 2 :

- X|x| > 0 so X is negative and eqn hold good. Sufficient.

Ans. B

It is almost related to the OA question : d-prep-77570.html
Director
Joined: 29 Aug 2005
Posts: 854

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08 Apr 2009, 13:24
/x-3/=3-x?
For the above to be true, 3-x<=0; or x<=3

Stmt1. x<>3 Not suff.
Stmt2. -x/x/>0; since /x/>0, -x>0 or x<0. Suff
B.
Re: gmat prep question   [#permalink] 08 Apr 2009, 13:24
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