absolute values?

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coolgirl26: Senior | Next Rank: 100 Posts; Posts: 71; Joined: Tue Mar 03, 2009 1:24 pm

by coolgirl26 » Wed Mar 04, 2009 7:45 pm

how do you solve for this

my answer was 1:S

but the answer is -x

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Source: Beat The GMAT — Problem Solving | Wed Mar 04, 2009 7:45 pm

NareshCS: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Sun Jan 11, 2009 10:47 pm

by NareshCS » Wed Mar 04, 2009 9:42 pm

Take any value of x such that x<0 (say x= -5)
sqrt(-(-5)(|-5|))= sqrt(5*5)=5 =-(-5)
which is only option A

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