Diketahui f(x) = x – 1 dan g(x) = 5 – 2x dan h(x) = 3x + 2 .Jika (f o g o h)(a) = 2, nilai a =
Diketahui f(x) = x – 1 dan g(x) = 5 – 2x dan h(x) = 3x + 2 .Jika (f o g o h)(a) = 2, nilai a = ....
Pembahasan:
f(x) = x – 1
g(x) = 5 – 2x
h(x) = 3x + 2
(f o g o h)(a) = 2
h(a) = 3a + 2
(g o h)(a) = g(h(a)) = g(3a + 2)
= 5 – 2(3a + 2)
= 5 – 6a – 4
(g o h)(a) = 1 – 6a
(f o g o h)(a) = f(g o h)(a)
= f(1 – 6a)
= 1 – 6a – 1
(f o g o h)(a) = -6a
2 = -6a
a = -1/3
Jadi nilai a adalah -1/3.
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