Jika f(x) = x2 – 5x + 2 dan g(x) = 2x – 1, fungsi komposisi (f o g)(x) =
Jika f(x) = x2 – 5x + 2 dan g(x) = 2x – 1, fungsi komposisi (f o g)(x) = ….
A. 4x2 + 14x – 5
B. 4x2 – 14x + 8
C. 2x2 – 10x + 3
D. x2 – 3x + 1
E. x2 – 7x + 3
Pembahasan:
f(x) = x2 – 5x + 2
g(x) = 2x – 1
(f o g)(x) = f(g(x)
= f(2x – 1)
= (2x – 1)2 – 5(2x – 1) + 2
= 4x2 – 4x + 1 – 10x + 5 + 2
= 4x – 14x + 8
Jawaban: B
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