Advanced Math practice question

Answer: 2

(x − y)² = 2(x² + y²) − (x + y)² = 68 − 64 = 4, so x − y = 2 since x > y.

Common wrong answers

If you answered 4

4 is (x − y)², not x − y.

If you answered 15

15 is xy.

If you answered -2

−2 is ruled out because x > y.

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