Question

Daerah hasil fungsi kuadrat f<x> = -3x² + 12x + 8 adalah

a. {y | y < 20}
b. {y | y < 10}
c. {y | y < 8}
d. {y | y > 20}
e. {y | y > 10}

Answer 1

F(X)= -3x² + 12x + 8
x = -b/2a
x = -12/ (2(-3))
x = 2
f(2) = -3(2²) + 12(2) + 8
f(2) = -12 + 24 + 8
f(2) =  20
titik puncak (2, 20)
nilai y ]{ y | y ≤ 20