Advanced Math practice question

Answer: 3

2x² = 18, so x² = 9 and x = 3.

Common wrong answers

If you answered 9

9 is x², not x.

If you answered 4.5

4.5 is 9/2 — a slip after subtracting 1; x² = 18/2 = 9, then take the root.

If you answered 3.16

3.16 is √10, dividing 19 by 2 before subtracting 1.

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