diketahui f(x) = 5x-7 dan g(x) = x+5, maka (fog)(x) adalah..

(f•g) (x) = 5(x+5) - 7
= 5x + 25 - 7
= 5x + 18

↪f(x) = 5x - 7
↪g(x) = x + 5

Ditanya
↪ (f o g) (x).....?

Jawaban :
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(f o g) (x) = f(g(x)) = f(x + 5)

(f o g) (x) = 5(x + 5) - 7

(f o g) (x) = 5x + 25 - 7

(f o g) (x) = 5x + 18