Advanced Math practice question

Answer: -2

f(x) = a(x + 1)² + 12. From f(1) = 4: 4a + 12 = 4, so a = −2.

Common wrong answers

If you answered 2

2 has the wrong sign; a maximum needs a negative leading coefficient.

If you answered -4

−4 forgets to divide by (1 + 1)² = 4.

If you answered -8

−8 is 4a, not a.

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