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# Roots

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Senior Manager
Joined: 05 Oct 2008
Posts: 263

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27 Jan 2009, 03:50
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Is rt[(x-3)^2] = 3-x?

x is not equal to 3
-x (times) absolute x > 0
Manager
Joined: 28 Apr 2008
Posts: 110

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27 Jan 2009, 05:19
B

sqrt((x-3)^2)=|x-3|, because in gmat math we only pick the positive solution of the sqrt.

1) insufficient- x can be 4 in which case the result is x-3, and can be 2, in which case the result is 3-x

2) sufficient--> if x is -ve then x-3 is negative too, so sqrt((x-3)^2)=|x-3| =3-x
CEO
Joined: 29 Mar 2007
Posts: 2523

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27 Jan 2009, 08:15
study wrote:
Is rt[(x-3)^2] = 3-x?

x is not equal to 3
-x (times) absolute x > 0

S1: X=0 or X= 4 Yes/No

S2: X is negative, suff.
Re: Roots   [#permalink] 27 Jan 2009, 08:15
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# Roots

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