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

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Intern
Joined: 14 Jun 2005
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What is the value of (x - y)^4? (1) The product of x and y [#permalink]

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08 Oct 2005, 14:10
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What is the value of (x - y)^4?

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

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Director
Joined: 21 Aug 2005
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08 Oct 2005, 14:14

A) insuff. We need to find x & y. With A, there can be multiple values for each.
B) insuff. Just knowing they are integers doesn't help

Consider A and B together,
Since 7 is a prime number, it has only 2 factors 1 and 7.
x,y=1,7. Since we need to find the even square of their difference, whether x=1 or 7, the answer is the same.

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08 Oct 2005, 14:14
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