R = 1-2xy+x2y2 : GMAT Problem Solving (PS)
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# R = 1-2xy+x2y2

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Manager
Joined: 27 Feb 2010
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27 Apr 2010, 05:43
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81% (59:21) correct 19% (01:42) wrong based on 100 sessions

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If R = 1-2xy+x2y2, what is the value of xy ? Note : x2y2 is x sqr y sqr

(1) R = 0
(2) x > 0

[Reveal] Spoiler:
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Manager
Joined: 07 May 2008
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27 Apr 2010, 06:23
R = (1-xy)^2

Statement 1 R=0

(1-xy)^2 = 0

Statement 1 is sufficient
Senior Manager
Joined: 24 Jul 2009
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28 Apr 2010, 00:09
Statement 1 is enough. A
Re: R = 1-2xy+x2y2   [#permalink] 28 Apr 2010, 00:09
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