gmat prep question

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vaivish: Master | Next Rank: 500 Posts; Posts: 371; Joined: Tue Apr 29, 2008 10:16 amFollowed by: 1 member; Thanked: 6 times

by vaivish » Tue Sep 30, 2008 5:22 am

need help on this on,....

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Source: Beat The GMAT — Problem Solving | Tue Sep 30, 2008 5:22 am

4meonly: Legendary Member; Posts: 891; Joined: Sat Aug 16, 2008 4:21 amFollowed by: 1 member; Thanked: 27 times; GMAT Score:660(

by 4meonly » Tue Sep 30, 2008 7:15 am

because under square root you can have only positive number and is x<0,
-x*mod(x) wiil yield a posive number, here -x

try it with -5, you'll get 5

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stop@800: Legendary Member; Posts: 871; Joined: Wed Aug 13, 2008 7:48 am; Thanked: 48 times

by stop@800 » Tue Sep 30, 2008 9:18 am

4meonly has given good solution.

An alternate would be take x = -y
and solve for y
and at end replace with x

HTH

www.interrogationpoint.com

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