Contoh
Diketahui f(x) = x2 – 4x + 6 dan g(x) = 2x + 3. Fungsi komposisi (f ∘ g) (x) = …
A.
2x2 – 8x + 12
B.
2x2 – 8x + 15
D.
4x2 + 4x + 15
E. 4x2
+ 4x + 27
Jawab:
f(x) = x2 – 4x + 6
(f ∘ g) (x) = f (g(x))
= f (2x + 3)
= (2x
+ 3)2 – 4(2x + 3) + 6
= 4x2 + 12x + 9 – 8x
– 12 + 6
= 4x2 + 4x + 3
Jawaban: C
Contoh
Diketahui f(x) = x + 3 dan g(x)
= x2 – 5x + 1. Fungsi komposisi (g ∘ f) (x) = …
A. x2 + x – 5
B. x2 + x + 10
C. x2 + x + 13
D. x2 – 5x + 13
E. x2 – 5x + 4
Jawab:
f(x) = x + 3 dan
g(x) = x2 – 5x + 1
(g∘ f) (x) = g (f(x))
= g (x + 3)
= (x + 3)2
– 5(x + 3) + 1
= x2
+ 6x + 9 – 5x – 15 + 1
= x2
+ x – 5
Jawaban: A
Sumber
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