Advanced Math practice question

Answer: 3

n² − 9 = 0 gives n² = 9, so n = 3.

Common wrong answers

If you answered 9

9 is n², not n.

If you answered 4.5

4.5 halves 9 instead of taking the square root.

If you answered -3

−3 also squares to 9, but the number is positive.

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