Advanced Math practice question

Answer: 16

(x + 3x)² / x² = (4x)² / x² = 16x²/x² = 16.

Common wrong answers

If you answered 4

4 is (x + y)/x, forgetting to square.

If you answered 9

9 is y²/x².

If you answered 10

10 is (x² + y²)/x², treating (x + y)² as x² + y².

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