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Is XY>0? Stmt 1: (x-y)^2 = 8 Stmt 2: (x-y)^2 = 10 Any

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Intern
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Is XY>0? Stmt 1: (x-y)^2 = 8 Stmt 2: (x-y)^2 = 10 Any [#permalink] New post 18 Jul 2006, 10:36
Is XY>0?

Stmt 1: (x-y)^2 = 8

Stmt 2: (x-y)^2 = 10

Any ideas on how to solve this? Thanks for your help!
Senior Manager
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Re: Is XY>0 [#permalink] New post 18 Jul 2006, 10:48
Dallas Jockey wrote:
Is XY>0?

Stmt 1: (x-y)^2 = 8

Stmt 2: (x-y)^2 = 10

Any ideas on how to solve this? Thanks for your help!

Is one of them (x+y)^2 ??
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Re: Is XY>0 [#permalink] New post 18 Jul 2006, 13:45
No, both are (x-y)^2. This is from a reputed online GMAT test, so i doubt if the question is incorrect......I can't rule out their typos though...


[quote="sgrover"][quote="Dallas Jockey"]Is XY>0?

Stmt 1: (x-y)^2 = 8

Stmt 2: (x-y)^2 = 10

Any ideas on how to solve this? Thanks for your help![/quote]
Is one of them (x+y)^2 ??[/quote]
Director
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 [#permalink] New post 18 Jul 2006, 13:52
Hmm... so we can rule out C at the outset.

A and B can be ruled out, IMO, they do not give us any info. And by extension, D as well.

Remaining is E. :?:
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 [#permalink] New post 18 Jul 2006, 17:44
Yea luks E is the only choice, where I can seek shelter.

Wats the OA
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 [#permalink] New post 18 Jul 2006, 17:55
same here I get E.

however, I fail to understand how both can be (x+y)^2
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 [#permalink] New post 18 Jul 2006, 18:04
St1:

(x-y)^2 = 8
(x-y) = +/- sqrt(8)

Can be x positive and y negative, or x negative and y negative. Insufficient.

St2:
(x-y)^2 = 10

Same thing as St1.

Impossible to use both St1 and St2 since they (x-y)^2 actually ended up with two values.

I'm going with E. But I have to say this question is definitely incorrect. To my knowledge, GMAT DS stems do not have conflicting statements.
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 [#permalink] New post 18 Jul 2006, 21:03
The only plausible solution seems to be E.
  [#permalink] 18 Jul 2006, 21:03
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