Jika f(x) = -1/2 x, g(x) = 2x + 4, dan h(x) = x2 - 2, maka (f o g o h)(2) =
Jika f(x) = -1/2 x, g(x) = 2x + 4, dan h(x) = x2 - 2, maka (f o g o h)(2) = ….
A. 10
B. 8
C. 4
D. -2
E. -4
Pembahasan:
f(x) = -1/2 x, g(x) = 2x + 4, dan h(x) = x2 – 2
(f o g o h)(2) = …. ?
(g o h)(x) = g(h(x))
= g(x2 – 2)
= 2(x2 – 2) + 4
(g o h)(x) = 2x2
(f o g o h)(x) = f((g o h)(x))
= f(2x2)
= -½ (2x2)
(f o g o h)(x) = -x2
Sehingga (f o g o h)(2) = -22 = -4
Jawaban: E
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