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Ian Stewart: GMAT Instructor; Posts: 2621; Joined: Mon Jun 02, 2008 3:17 am; Location: Montreal; Thanked: 1090 times; Followed by:355 members; GMAT Score:780

by Ian Stewart » Wed Jul 30, 2008 10:07 am

This question is not printed correctly - one of two or three errors you might come across in GMATPrep. It should read:

2^[(x+y)^2] / 2^[(x-y)^2]

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sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pm; Location: INDIA; Thanked: 84 times; Followed by:3 members

by sudhir3127 » Wed Jul 30, 2008 10:07 am

Me not sure abt the image as well..but my guess is it shud be

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

therefore

solving the exponent

(x+y)^2- (x-y)^2= 4xy = 4(1) = 4

hence the naswer is 2^4= 16.

Let me know if u have any doubts..

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harish: Senior | Next Rank: 100 Posts; Posts: 42; Joined: Fri May 30, 2008 10:30 pm; Location: India

by harish » Wed Jul 30, 2008 9:40 pm

Thanks everyone..
How foolish..I dint realise it was 2^(x+y)^2
I thought it was 2(x+y)^2
Some part of the blame also goes to the way it is shown..not clear if it is 2^( or 2(
Thanks anyway..

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GMAT/MBA Expert

Ian Stewart: GMAT Instructor; Posts: 2621; Joined: Mon Jun 02, 2008 3:17 am; Location: Montreal; Thanked: 1090 times; Followed by:355 members; GMAT Score:780

by Ian Stewart » Thu Jul 31, 2008 2:45 am

harish wrote:Thanks everyone..
How foolish..I dint realise it was 2^(x+y)^2
I thought it was 2(x+y)^2
Some part of the blame also goes to the way it is shown..not clear if it is 2^( or 2(
Thanks anyway..

It's not your fault- it's a problem with the display of the question. That is, it's GMATPrep's fault. As the question is displayed now, you were perfectly correct to assume what you did.

If you see exponents on the real GMAT, it will be obvious that they are exponents.

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