Advanced Math practice question

Answer: 4

x² − 4x + 4 = (x − 2)², so (x − 2)² = 25 → x − 2 = ±5 → x = 7 or x = −3. The sum is 4.

Common wrong answers

If you answered 2

2 is the axis of symmetry, half the sum.

If you answered 10

10 is the difference of the solutions.

If you answered -21

−21 is the product of the solutions.

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