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What is the value of (x-y)^4? 1) the product of x and y is 7

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Manager
Manager
Joined: 23 Mar 2008
Posts: 226
Followers: 1

Kudos [?]: 7 [0], given: 0

GMAT Tests User
What is the value of (x-y)^4? 1) the product of x and y is 7 [#permalink] New post 09 May 2008, 03:51
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
What is the value of (x-y)^4?

1) the product of x and y is 7
2) x and y are integers
Current Student
Joined: 28 Dec 2004
Posts: 3411
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 148 [0], given: 2

GMAT Tests User
Re: DS: value [#permalink] New post 09 May 2008, 04:38
looks to be C..

(x-y)^4?

xy=7..

well x=1 then y=7 (1-7)^4 or x=7 y=1 (7-1)^4. same

but say x=1/7 y=7 (1/7 -7)^4 will have different value..

x and y integers..hmm
not much..insuff

togther..
suppose x=-1 y=-7 (-1+7) or (-7+1)..same value..

C it is
SVP
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Joined: 28 Dec 2005
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Re: DS: value [#permalink] New post 09 May 2008, 05:22
I think it is C as well; with stat 1, you dont know if x and y are integers, so not suff.

with stat 2, you know x and y are integers, but they can be anything. insuff.

together, the only possible values are 7 and 1. it doesnt matter which is x and which is y, because you are squaring twice, so you will get the same answer.
Re: DS: value   [#permalink] 09 May 2008, 05:22
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What is the value of (x-y)^4? 1) the product of x and y is 7

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