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Difficulty—
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
(A) 0
(B) 11
(C) -1
(D) -11
(E) 121
Answer: C
Source: Magoosh
