Diketahui (f o g)(x) = x2 + 7x – 4. Tentukan: f(x) jika g(x) = x + 2
Diketahui (f o g)(x) = x2 + 7x – 4. Tentukan:
f(x) jika g(x) = x + 2
Jawab:
g(x) = x + 2
(f o g)(x) = x2 + 7x – 4
f(g(x)) = x2 + 7x – 4
f(x + 2) = x2 + 7x – 4
f(x + 2) = (x + 2)2 + 3(x + 2) – 14
f(x) = x2 + 3x – 14
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