Diketahui f(x) = x2 + 4x – 7 dan g(x) = x2 – 2x – 3. Tentukan f(-5) dan (g o f)(-5)
Diketahui f(x) = x2 + 4x – 7 dan g(x) = x2 – 2x – 3. Tentukan f(-5) dan (g o f)(-5)!
Jawab:
f(x) = x2 + 4x – 7
g(x) = x2 – 2x – 3
f(-5) = (-5)2 + 4. (-5) – 7
= 25 – 20 – 7
f(-5) = -2
(g o f)(-5) = g(f(-5))
= g(-2)
= (-2)2 – 2(-2) – 3
= 4 + 4 – 3
(g o f)(-5) = 5
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