Diketahui fungsi f(x) = 6x – 3, g(x) = 5x + 4, dan (f o g)(a) = 81. Nilai a =
Diketahui fungsi f(x) = 6x – 3, g(x) = 5x + 4, dan (f o g)(a) = 81. Nilai a = ….
Jawab:
f(x) = 6x – 3, g(x) = 5x + 4,
(f o g)(x) = f(g(x))
= 6(5x + 4) – 3
= 30x + 24 – 3
(f o g)(x) = 30x + 21
(f o g)(a) = 30a + 21= 81
30a = 60
a = 2
Jadi nilai a adalah 2.
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