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# if xy=1 what is the value of 2(x+y)^2/2(x-y)^2 ? thanks

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Manager
Joined: 21 Mar 2006
Posts: 127
if xy=1 what is the value of 2(x+y)^2/2(x-y)^2 ? thanks  [#permalink]

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24 May 2008, 23:59
if xy=1 what is the value of 2(x+y)^2/2(x-y)^2 ?

thanks,

--== Message from GMAT Club Team ==--

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VP
Joined: 18 May 2008
Posts: 1176

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25 May 2008, 09:10
Can i have the options. Have tried my hand at the problem but am not sure. So please post the options as well. Waise im getting naswer as 1

abhaypratapsingh wrote:
if xy=1 what is the value of 2(x+y)^2/2(x-y)^2 ?

thanks,
Manager
Joined: 11 Apr 2008
Posts: 128
Location: Chicago

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28 May 2008, 16:00
I get some really off the wall answer. Does anyone know the solution and explanation?
_________________

Factorials were someone's attempt to make math look exciting!!!

SVP
Joined: 29 Mar 2007
Posts: 2483

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29 May 2008, 10:35
abhaypratapsingh wrote:
if xy=1 what is the value of 2(x+y)^2/2(x-y)^2 ?

thanks,

Ya im not getting this either.
SVP
Joined: 29 Mar 2007
Posts: 2483

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29 May 2008, 12:24
Extremepbs wrote:
Ans is 16.

Can you show your work plz?
Director
Joined: 01 May 2007
Posts: 786

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29 May 2008, 12:28
this one has been on the board several times...there is a typo...one of the only ever seen in gmatprep. but it is copied correctly.
SVP
Joined: 29 Mar 2007
Posts: 2483

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29 May 2008, 13:47
jimmyjamesdonkey wrote:
this one has been on the board several times...there is a typo...one of the only ever seen in gmatprep. but it is copied correctly.

You wouldn't happen to have the links would you?
Director
Joined: 23 Sep 2007
Posts: 760

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29 May 2008, 18:06
This is probally a new (old) question that just got inserted (reinserted) into the most up to date version of the gmatprep. I was using the older version for a while and I had not encountered it despite having taken many tests. I updated the gmatprep version 2 days ago and I just encountered this question for the first time. I will post the screen capture when I finish with the verbal part.
Current Student
Joined: 28 Dec 2004
Posts: 3280
Location: New York City
Schools: Wharton'11 HBS'12

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29 May 2008, 18:32
abhaypratapsingh wrote:
if xy=1 what is the value of 2(x+y)^2/2(x-y)^2 ?

thanks,

i believe the question is 2^(x+y)^2 / 2^(x-y)^2...

if you expand this out we get 2^4xy..xy=1 so 2^4=16
Director
Joined: 23 Sep 2007
Posts: 760

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29 May 2008, 19:35
1
Here is the picture of the great white elephant.
Attachments

quanterror.JPG [ 13.47 KiB | Viewed 1011 times ]

CEO
Joined: 17 May 2007
Posts: 2888

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30 May 2008, 02:38
typo it is ... no way I can solve it .. I tried everything .. +1 for the screenie
Manager
Joined: 16 Oct 2008
Posts: 54

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12 Nov 2008, 03:22
gmatnub wrote:
Here is the picture of the great white elephant.

Can anyone show step to solve this problem, please?
Intern
Joined: 12 Nov 2008
Posts: 3

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13 Nov 2008, 01:21
very difficult...
anyone can show me how to derive to 4^2*xy?
Thanks!
VP
Joined: 17 Jun 2008
Posts: 1474

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13 Nov 2008, 02:48
There must be a typo. I think what freshinha has explained could be true.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: GMAT prep &nbs [#permalink] 13 Nov 2008, 02:48
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