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Positive integer \(n\) is equal to the difference of the squares of \(x\) and \(y,\) where \(x\) and \(y\) are integers.

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Positive integer \(n\) is equal to the difference of the squares of \(x\) and \(y,\) where \(x\) and \(y\) are integers.

by Vincen » Thu Nov 26, 2020 11:26 am

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Positive integer \(n\) is equal to the difference of the squares of \(x\) and \(y,\) where \(x\) and \(y\) are integers. If \(n\) is equal to \(21,\) then which of the following could be the sum of \(x\) and \(y?\)

(A) 0

(B) 11

(C) -1

(D) -11

(E) 121

Answer: C

Source: Magoosh
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