Jika f(x) = 2x2 + 5x - 7 dan g(x) = 3x - 12, maka nilai (g o f)(2) =
Jika f(x) = 2x2 + 5x - 7 dan g(x) = 3x - 12, maka nilai (g o f)(2) = …..
A. 19
B. 21
C. 27
D. 31
E. 35
Pembahasan:
f(x) = 2x2 + 5x – 7 dan g(x) = 3x – 12
(g o f)(2) = …. ?
(g o f)(x) = g(f(x))
= g(2x2 + 5x – 7)
= 3(2x2 + 5x – 7) – 12
(g o f)(x) = 6x2 + 15x – 33
Jadi (g o f)(2) = 6(2)2 + 15(2) – 33 = 24 + 30 – 33 = 21
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