Diketahui f(x) = 3x + 2 dan g(x) = x2 + 2x – 7. Nilai (f . g)(-3) =
Diketahui f(x) = 3x + 2 dan g(x) = x2 + 2x – 7. Nilai (f . g)(-3) = ….
Pembahasan:
f(x) = 3x + 2 dan g(x) = x2 + 2x – 7
(f . g)(x) = (3x + 2)(x2 + 2x – 7)
(f . g)(-3) = (3(-3) + 2)((-3)2 + 2(-3) – 7)
= (-9 + 2)(9 – 6 – 7)
= (-7)(-4)
= 28
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