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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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