Advanced Math practice question

Answer: 4 or -4

9 + y² = 25 gives y² = 16, so y = 4 or y = −4.

Common wrong answers

If you answered 5

5 is √25, ignoring x.

If you answered 16

16 is y², not y.

If you answered 22

22 subtracts 3 instead of 9.

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