Diketahui (g o f)(x) = 9x2 – 6x + 2. Tentukan: f(x) jika g(x) = 3x + 14
Diketahui (g o f)(x) = 9x2 – 6x + 2. Tentukan: f(x) jika g(x) = 3x + 14
Jawab:
g(x) = 3x + 14
f(x) = .... ?
(g o f)(x) = 9x2 – 6x + 2
g(f(x)) = 9x2 – 6x + 2
3f(x) + 14 = 9x2 – 6x + 2
3f(x) = 9x2 – 6x – 12
f(x) = 3x2 – 2x – 4
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