Diketahui f(x) = 3x + 7 dan

Diketahui f(x) = 3x + 7 dan (f o g)(x) = 6×2 + 9x – 2, maka g(x) = ….
A.6×2 + 9x – 9
B.3×2 + 3x – 3
C.2×2 + 2x – 1
D.2×2 + 3x – 3
E.x2 + x – 1
Pembahasan:
f(x) = 3x + 7
(f o g)(x) = 6×2 + 9x – 2
f(g(x)) = 6×2 + 9x – 2
3g(x) + 7 = 6×2 + 9x – 2
3g(x) = 6×2 + 9x – 9
g(x) = 2×2 + 3x – 3
Jawaban: D
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