Advanced Math practice question

Answer: 10

f(x) = a·x(x − 6). From f(3) = 18: −9a = 18, so a = −2, and f(1) = −2(1)(−5) = 10.

Common wrong answers

If you answered 5

5 uses a = −1 without checking f(3).

If you answered 18

18 is f(3), not f(1).

If you answered -10

−10 uses a = 2, giving a minimum rather than the stated peak.

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