Question

Pada fungsi f(x) = -1/4 x-6 .
Tentukan : a) f(-8) dan f(4)
b) Nilai x, jika f(x) = -12

Kasih tau jawabannya yaa .. + Cara !! Okee

Answer 1

F(x) = -¼x - 6

a) f(-8) = -¼ × 8 - 6
= (-2) - 6
= (-8)
f(4) = -¼ × 4 - 6
= (-1) - 6
= (-7)

b) f(x) = -¼x - 6
12 = -¼x - 6
12 + 6 = -¼x
18 = -¼x
x = 18 : (-¼)
x = 18 × (-4)
x = (-72)