Jika g(x) =2x-5 dan (f•g) (x) = 6x-13 maka f(3)

g(x) = 2x - 5
(fog)(x) = 6x - 13
maka f(x) = 3x + 2
jadi, f(3) = 3(3) + 2 = 9 + 2 = 11

Dik :
g(x) = 2x-5
(fog) (x) = 6x-13
f(-3)=...???

peny :

g'(x) = 2x - 5
Y = 2x - 5
2x = Y + 5
x = (Y + 5)/2
g'(x) = (x + 5)/2

(fog) O g'(x) = f(x)
(6x - 13) O (x + 5)/2 = f(x)
f(x) = 3x+2
f(-3)= 3(3) + 2
f(-3) = 11