Diketahui f(x) = x2 – 3x + 4 dan g(x) = 2x + 1. Tentukan (fog)(x) dan (gof)(x)
Diketahui f(x) = x2 – 3x + 4 dan g(x) = 2x + 1. Tentukan (fog)(x) dan (gof)(x)!
Pembahasan:
f(x) = x2 – 3x + 4
g(x) = 2x + 1
(fog)(x) = f(g(x))
= f(2x + 1)
= (2x + 1)2 – 3(2x + 1) + 4
= 4x2 + 4x + 1 – 6x – 3 + 4
(fog)(x) = 4x2 – 2x + 2
(gof)(x) = g(f(x))
= g(x2 – 3x + 4)
= 2(x2 – 3x + 4) + 1
= 2x2 – 6x + 8 + 1
(gof)(x) =2x2 – 6x + 9
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