Diketahui (g o f)(x) = 9x2 – 6x + 2. Tentukan: g(x) jika f(x) = 3x – 5
Diketahui (g o f)(x) = 9x2 – 6x + 2. Tentukan: g(x) jika f(x) = 3x – 5
Jawab:
f(x) = 3x – 5
g(x) = …. ?
(g o f)(x) = 9x2 – 6x + 2
g(f(x)) = 9x2 – 6x + 2
g(3x – 5) = 9x2 – 6x + 2
g(3x – 5) = (3x – 5)2 + 8(3x – 5) + 17
g(x) = x2 + 8x + 17
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