Advanced Math practice question

Answer: 3

One solution means a perfect square: (x − 3)² = 0, so c = 9 and x = 3.

Common wrong answers

If you answered 6

6 is the sum of the two equal roots.

If you answered 9

9 is c, not the solution.

If you answered -3

−3 has the wrong sign; (x + 3)² would need +6x.

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