Diketahui f(x) = 3x + 1 dan g(x) = 5x + 3, tentukan:
Diketahui f(x) = 3x + 1 dan g(x) = 5x + 3, tentukan:
a. (fog) (x)
b. (gof) (x)
Jawab:
f(x) = 3x + 1
g(x) = 5x + 3
a. (fog) (x) = f(g(x))
= f(5x + 3)
= 3(5x + 3) + 1
= 15x + 9 + 1
(fog) (x) = 15x + 10
b. (gof) (x) = g(f(x))
= g(3x + 1)
= 5(3x + 1) + 3
= 15x + 5 + 3
(gof) (x) = 15x + 8
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