Jika f(x) = 2x – 3 dan (f o g)(x) = 4x2 – 6x + 5, fungsi g(x) =
Jika f(x) = 2x – 3 dan (f o g)(x) = 4x2 – 6x + 5, fungsi g(x) = ….
A. x2 + 3x + 7
B. x2 – 4x – 5
C. 2x2 – 3x + 4
D. 2x2 + 4x – 5
E. 4x2 – 6x + 8
Pembahasan:
f(x) = 2x – 3
g(x) = …. ?
(f o g)(x) = 4x2 – 6x + 5
f(g(x)) = 4x2 – 6x + 5
2g(x) – 3 = 4x2 – 6x + 5
2g(x) = 4x2 – 6x + 8
g(x) = 2x2 – 3x + 4
Jawaban: C
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