SQRT[(x-5)^2] = Abs (x-5)

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LSB: Master | Next Rank: 500 Posts; Posts: 229; Joined: Thu Nov 08, 2007 3:47 pm; Thanked: 14 times; GMAT Score:750

by LSB » Mon Sep 01, 2008 3:46 am

Hi there - Writing the test tomorrow and would like to confirm one thing with you guys. Is it true that the below always holds. If this is true we never assume a negative sqrt ... correct?

SQRT[(x-5)^2] = Abs (x-5)

Thanks everyone

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Source: Beat The GMAT — Problem Solving | Mon Sep 01, 2008 3:46 am

kshankker: Senior | Next Rank: 100 Posts; Posts: 30; Joined: Fri Jul 04, 2008 5:28 am; Thanked: 1 times

by kshankker » Mon Sep 01, 2008 6:12 am

Yeah you are correct......squareroot (any term ) = positive ans.:
only (any term ) square = +/- ans.

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