Jika (fog)(x) = x2 + 5 dan f(x) = x + 7. Tentukan g(-3) =
Jika (fog)(x) = x2 + 5 dan f(x) = x + 7. Tentukan g(-3) = ….
A. 16
B. 18
C. 20
D. 22
E. 24
Pembahasan:
(fog)(x) = x2 + 5
f(g(x)) = x2 + 5
g(x) + 7 = x2 + 5
g(x) = x2 + 5 – 7
g(x) = x2 – 2
g(-3) = (-3)2 – 2
= 9 – 2
g(-3) = 7.
Jawaban: -
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