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What is the value of (x-y)^4?

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What is the value of (x-y)^4? [#permalink] New post 24 Dec 2008, 14:03
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Set 1 Question 10

What is the value of (x-y)^4?

1. The product of x and y is 7.
2. x and y are integers.

The answer should be c.. right?? Simply because the only integers that could have the sum of 7 are 1 and 7


Just wanted to confirm the logic.
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Re: DS: Question [#permalink] New post 24 Dec 2008, 21:04
The product of x and y are 7.
In this case x and y can be either 1 and 7 or -1 and -7.
Hence in both case scenario the value of (x-y)^4 will be the same.
So the answer should be C.
What is the OA?
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Re: DS: Question [#permalink] New post 26 Dec 2008, 00:03
subarao wrote:
The product of x and y are 7.
In this case x and y can be either 1 and 7 or -1 and -7.
Hence in both case scenario the value of (x-y)^4 will be the same.
So the answer should be C.
What is the OA?


(1-7)^4 = (7-1)^4 = (-1-(-7))^4 = (-7-(-1))^4 =6^4

A is the best
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Re: DS: Question [#permalink] New post 26 Dec 2008, 23:11
C. You can't assume these are integers.

(28-.25) ^ 4 = 551399.0664
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Re: DS: Question [#permalink] New post 08 Jan 2009, 12:28
sorry for the delay. but the OA is C

and thanks guys... for your help
Re: DS: Question   [#permalink] 08 Jan 2009, 12:28
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