Jika f(x) = x2 + 3x + 5 dan g(x) = 2x – 1, nilai (f o g)(-1) =
Jika f(x) = x2 + 3x + 5 dan g(x) = 2x – 1, nilai (f o g)(-1) = ….
A. -4
B. -1
C. 2
D. 5
E. 8
Pembahasan:
f(x) = x2 + 3x + 5
g(x) = 2x – 1
g(-1) = 2 . (-1) – 1 = -3
sehingga:
(f o g)(-1)
= f(g(-1))
= f(-3)
= (-3)2 + 3(-3) + 5
= 9 – 9 + 5
= 5
Jawaban: D
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