Diketahui f(x) = 5x + 2 dan

Diketahui f(x) = 5x + 2 dan g(x) = 3 – 2x. Jika (f o g)(a) = -3, nilai a = ….
A.-2
B.-1
C.1
D.2
E.3
Pembahasan:
f(x) = 5x + 2
g(x) = 3 – 2x
(f o g)(a) = -3
f(g(a)) = -3
f(3 – 2a) = -3
5(3 – 2a) + 2 = -3
15 – 10a + 2 = -3
10a = 20
a = 2
Jawaban: D
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