Advanced Math practice question

Answer: A. 2

The parabola's vertex is at x = 3, where y = 9 − 18 + 11 = 2. A horizontal line touches it once only at the vertex: k = 2.

Why the other answers are wrong

B. 11

11 is the y-intercept; y = 11 crosses the parabola at two points (x = 0 and 6).

C. 3

3 is the vertex's x-coordinate, not its y-coordinate.

D. −6

−6 is the coefficient of x.

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