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R = 1-2xy+x2y2

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Manager
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Joined: 27 Feb 2010
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R = 1-2xy+x2y2 [#permalink] New post 27 Apr 2010, 05:43
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Difficulty:

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Question Stats:

50% (01:46) correct 50% (01:48) wrong based on 8 sessions
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:
A
Manager
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Re: R = 1-2xy+x2y2 [#permalink] New post 27 Apr 2010, 06:23
R = (1-xy)^2

Statement 1 R=0

(1-xy)^2 = 0

Statement 1 is sufficient
Senior Manager
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Re: R = 1-2xy+x2y2 [#permalink] New post 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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R = 1-2xy+x2y2

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