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) = ….
Jawab:
f(x) = 3x + 2
g(x) = x2 + 2x – 7
(f × g)(-3) = …. ?
f(-3) = 3(-3) + 2 = -7
g(-3) = (-3)2 + 2(-3) – 7 = 9 – 6 – 7 = -4
(f × g)(-3) = f(-3) × g(-3)
= (-7) × (-4)
= 28
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