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Algebra !

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Algebra ! [#permalink] New post 17 Jan 2006, 02:57
I could not solve following question in my GMATPrep practice test! Any divine insight !

If xy=1, what is the value of

2(x+y)^2
--------------
2(x-y)^2

Answer Choice
A) 2
B) 4
C) 8
D) 16
E) 32

According to GMATPrep Answer is 16 !

Chirag
BTW, this is my first post...
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Re: Algebra ! [#permalink] New post 17 Jan 2006, 03:19
chiragr wrote:
I could not solve following question in my GMATPrep practice test! Any divine insight !

If xy=1, what is the value of

2(x+y)^2
--------------
2(x-y)^2

Answer Choice
A) 2
B) 4
C) 8
D) 16
E) 32

According to GMATPrep Answer is 16 !

Chirag
BTW, this is my first post...
May be some typo?
2(x+y)^2
--------------
2(x-y)^2
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 [#permalink] New post 17 Jan 2006, 03:38
Yes I also feel that it's a typo... though this is official GMATPrep question which I encounterd yesterday!
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 [#permalink] New post 17 Jan 2006, 03:44
Lets wait for our Math Gurus!Matt!!duttsit!allabout!TeHCM
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 [#permalink] New post 17 Jan 2006, 08:21
don't know .. looks like a typo to me too.
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 [#permalink] New post 17 Jan 2006, 14:49
Their is certainly a typo here. This question has been discussed many times in the forum, but nobody got an answer.
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 [#permalink] New post 17 Jan 2006, 14:59
My apologies for vesting bendwidth of this forum and precious time of members, particularly as this question has been discussed many times before...

But this question has made me active member of GMAT club... :)
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 [#permalink] New post 17 Jan 2006, 22:39
no apologies buddy, just keep posting
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Still wating !!! [#permalink] New post 17 Jan 2006, 23:33
Hello grp !

I too faced this question yesterday ! Can anyone post the possible solution to this ???

btw. the anwer is 16 !
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Re: Still wating !!! [#permalink] New post 17 Jan 2006, 23:43
copper_waters wrote:
Hello grp !

I too faced this question yesterday ! Can anyone post the possible solution to this ???

btw. the anwer is 16 !

where must be some solution))but the question stem probably have a typo!
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 [#permalink] New post 23 Jan 2006, 13:15
There is certainly a typo. I believe the question should be:

2^((x+y)^2)/2^((x-y)^2). Anyway it does not make sense to have 2 in the Nr and Dr as well.

The question corrected in the way suggested gives 2^4xy which is 2^4 or 16 since xy=1.
  [#permalink] 23 Jan 2006, 13:15
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