GMATprep PS question

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mlane25269: Master | Next Rank: 500 Posts; Posts: 151; Joined: Fri Jun 13, 2008 7:31 am; Thanked: 1 times

by mlane25269 » Sat Jun 28, 2008 2:01 pm

Hi! Need some help on this problem. Thanks!

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Source: Beat The GMAT — Problem Solving | Sat Jun 28, 2008 2:01 pm

Motherjane: Senior | Next Rank: 100 Posts; Posts: 39; Joined: Sun Jun 15, 2008 10:50 pm; Thanked: 4 times

by Motherjane » Sat Jun 28, 2008 2:44 pm

The reason for so is that sqrt(x^2) can be both +x or -x.

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