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Not sure if this was already asked here. But what is the [#permalink] New post 06 Nov 2005, 14:53
Not sure if this was already asked here. But what is the quickest way to solve this one. Any ideas?

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

It would be great if you could please explain your approach. Thanks.
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 [#permalink] New post 06 Nov 2005, 15:28
I don't think the question is correct.

with the given informaton you can not caluculate the value.
However if the correct question is 2(x+y)^2 - 2(x-y)^2

then this is equals to 8.
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 [#permalink] New post 06 Nov 2005, 15:33
nakib77 wrote:
I don't think the question is correct.



I think so too. was trying and trying and trying... way over 1.75 minutes :)
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 [#permalink] New post 06 Nov 2005, 15:33
The Question seems to be correct. It was in the GMAT Prep 2 test and I struggled with it quite a bit.
I tried factoring both the denominator and numerator but could not get it right.
I have the OA and it is not 8. I'll wait for some one to take a shot at this before posting the OA.
Thanks,
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 [#permalink] New post 06 Nov 2005, 15:54
I get 1 as the answer. If the question was written like this:

2(x+y)^2/(x-y)^2 then the answer would be 2..... right? I don't see why they would multiply both the numerator and denominator by 2 since they automatically cancel each other out.
  [#permalink] 06 Nov 2005, 15:54
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