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Sorry to post so many questions, but for some reason these

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Senior Manager
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Sorry to post so many questions, but for some reason these [#permalink] New post 06 Sep 2005, 19:39
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Sorry to post so many questions, but for some reason these seem like they should be easy but I'm missing something somewhere.

If xy=1, what is the value of 2(x+y)^2 / 2(x-y)^2?

(1) 2
(2) 4
(3) 8
(4) 16
(5) 32

I'm really not seeing this one at all...
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 [#permalink] New post 07 Sep 2005, 02:31
I don't think anyone has figured it out yet.

Here is an earlier post.

http://www.gmatclub.com/phpbb/viewtopic.php?t=18273

One of my student workers is an EE major. We busted out the TI-89 (or whatever the latest version is) and we couldn't get a correct answer.
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Re: GMATPrep: Yet another PS [#permalink] New post 07 Sep 2005, 17:31
[2(x+y)^2]/[2(x-y)^2]
=(x+y)^2/(x-y)2
=[(x-y)^2+4xy]/(x-y)^2
=1+4/(x-y)^2
=1+4/(x-1/x)^2

x can be anything. Without knowing the value of x or y, there is no single answer to this problem, unless my reading of the question is not correct. The strangest thing is why there's the two 2s in both the denominator and numerator. Seems like there's a typo somewhere.
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keep on seeking, and you will find;
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Re: GMATPrep: Yet another PS   [#permalink] 07 Sep 2005, 17:31
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Sorry to post so many questions, but for some reason these

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