Diketahui f(x) = 4x – 5 dan g(x) = 6x + 3, tentukan:
Diketahui f(x) = 4x – 5 dan g(x) = 6x + 3, tentukan:
a. (fog) (x)
b. (gof) (x)
Jawab:
f(x) = 4x – 5
g(x) = 6x + 3
a. (fog) (x) = f(g(x))
= f(6x + 3)
= 4(6x + 3) – 5
= 24x + 12 – 5
(fog) (x) = 24x + 7
b. (gof) (x) = g(f(x))
= g(4x – 5)
= 6(4x – 5) + 3
= 24x – 30 + 3
(gof) (x) = 24x – 27
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