Advanced Math practice question

Answer: -9

g(x) = a(x + 1)(x − 5). From g(0) = −5: −5a = −5, so a = 1. The vertex is at x = 2, where g(2) = (3)(−3) = −9.

Common wrong answers

If you answered 2

2 is the x-coordinate of the vertex.

If you answered 9

9 has the sign wrong; the parabola opens upward, so the vertex is a minimum.

If you answered -5

−5 is the y-intercept, not the vertex.

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