Advanced Math practice question

Answer: 16

Substituting: x² + 4x² = 20, so x² = 4 and y² = 4x² = 16.

Common wrong answers

If you answered 4

4 is x², not y².

If you answered 8

8 is 2x², a slip in squaring 2x.

If you answered 20

20 is x² + y².

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