Diketahui f(x) = 2x + 1 dan g(x) = x2 – 3x – 5, nilai (g o f)(2) =
Diketahui f(x) = 2x + 1 dan g(x) = x2 – 3x – 5, nilai (g o f)(2) = ….
A. 5
B. 7
C. 10
D. 12
E. 15
Pembahasan:
f(x) = 2x + 1
g(x) = x2 – 3x – 5
f(2) = 2 . 2 + 1 = 4 + 1 = 5
(g o f)(2) = g(f(2))
= g(5)
= 52 – 3(5) – 5
= 25 – 15 – 5
(g o f)(2) = 5
Jawaban: A
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