Square root

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Mumbai: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Fri May 27, 2011 4:32 am

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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Source: Beat The GMAT — Problem Solving | Fri Jul 01, 2011 1:50 am

pemdas: Legendary Member; Posts: 1084; Joined: Fri Apr 15, 2011 2:33 pmFollowed by: 21 members; Thanked: 158 times

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]

Success doesn't come overnight!

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Mumbai: 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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