f(x) = x2 + x dan g(x) = 2x + 3 Tentukan (fog)(x) dan (gof)(x)
f(x) = x2 + x dan g(x) = 2x + 3
Tentukan (fog)(x) dan (gof)(x)!
Jawab:
(fog)(x) = f(g(x))
= (2x + 3)2 + 2x + 3
= 4x2 + 12x + 9 + 2x + 3
(fog)(x) = 4x2 + 14x + 12
(gof)(x) = g(f(x))
= 2(x2 + x) + 3
(gof)(x) = 2x2 + 2x + 3
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