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# Algebra !

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Senior Manager
Joined: 05 Jan 2006
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Algebra ! [#permalink]

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17 Jan 2006, 02:57
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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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Director
Joined: 09 Oct 2005
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Location: Madrid
Re: Algebra ! [#permalink]

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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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Senior Manager
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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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Director
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17 Jan 2006, 03:44
Lets wait for our Math Gurus!Matt!!duttsit!allabout!TeHCM
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Senior Manager
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17 Jan 2006, 08:21
don't know .. looks like a typo to me too.

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CEO
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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008

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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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Senior Manager
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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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Director
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17 Jan 2006, 22:39
no apologies buddy, just keep posting

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Intern
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Still wating !!! [#permalink]

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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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Director
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Re: Still wating !!! [#permalink]

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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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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.

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23 Jan 2006, 13:15
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# Algebra !

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