Advanced Math practice question

Answer: 9

The vertex is at x = −3, where y = 9 − 18 + c. Setting this to 0 gives c = 9.

Common wrong answers

If you answered 3

3 is the distance of the vertex from the y-axis.

If you answered 6

6 copies the coefficient of x.

If you answered -9

−9 has the sign wrong.

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