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Square root

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Junior | Next Rank: 30 Posts
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Square root

by Mumbai » Fri Jul 01, 2011 1:50 am
If x < 0 then sqrt( -x |x| ) is?

a. -x
b. -1
c. 1
d. x
e. sqrt(x)

Source - GMAT Prep

[spoiler]Answer - a : -x ; why not d : x?[/spoiler]
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by pemdas » Fri Jul 01, 2011 2:47 am
square root can not be resulting in negative number, as x<0 d is not correct
a is correct, as x<0 and -(-) is positive
Mumbai wrote:If x < 0 then sqrt( -x |x| ) is?

a. -x
b. -1
c. 1
d. x
e. sqrt(x)

Source - GMAT Prep

[spoiler]Answer - a : -x ; why not d : x?[/spoiler]
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Junior | Next Rank: 30 Posts
Posts: 13
Joined: Fri May 27, 2011 4:32 am

by Mumbai » Fri Jul 08, 2011 3:55 am
got it...Thanks Pemdas :) silly mistake though
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