Diketahui f(x) = 3x + 2 dan

Diketahui f(x) = 3x + 2 dan g(x) = x2 + 2x – 7. Nilai (f . g)(-3) = ….
A.-28
B.-11
C.7
D.11
E.28
Pembahasan:
f(x) = 3x + 2
g(x) = x2 + 2x – 7
(f . g)(-3) = …. ?
(f . g)(-3) = f(-3) . g(-3)
= (3(-3) + 2) . ((-3)2 + 2.(-3) – 7)
= (-9 + 2) . (9 – 6 – 7)
= (-7) . (-4)
= 28
Jawaban: E
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