Advanced Math practice question

Answer: -13 or −13

The vertex is at x = −12/(2 · 3) = −2. There, f(−2) = 3(4) − 24 − 1 = −13, the minimum since the parabola opens upward.

Common wrong answers

If you answered -2

−2 is the x-coordinate of the vertex, not the minimum VALUE of f.

If you answered -1

−1 is f(0), the y-intercept, not the lowest point.

If you answered -37

−37 comes from 3(4) − 48 − 1, doubling the 12x term; 12(−2) = −24.

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