Diketahui fungsi f(x) = x2 - 5x + 3, g(x) = 2x + 4. Tentukan: a. (fog)(x) b. (gof)(x)
Diketahui fungsi f(x) = x2 - 5x + 3, g(x) = 2x + 4. Tentukan:
a. (fog)(x)
b. (gof)(x)
Pembahasan:
a. (fog)(x) = f(g(x))
= f(2x + 4)
= (2x + 4)2 – 5(2x + 4) + 3
= 4x2 + 16x + 16 – 10x – 20 + 3
(fog)(x) = 4x2 + 6x – 1
b. (gof)(x) = g(f(x))
= g(x2 – 5x + 3)
= 2(x2 – 5x + 3) + 4
= 2x2 – 10x + 6 + 4
(gof)(x) = 2x2 – 10x + 10
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