Advanced Math practice question

Answer: 8

Square both sides: 2x + 9 = 25, so 2x = 16 and x = 8.

Common wrong answers

If you answered 16

16 is 2x, not x.

If you answered 17

17 subtracts 9 from 25 but forgets to halve.

If you answered -2

−2 sets 2x + 9 = 5 without squaring.

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