jika g(x)=2x-5 dan (f.g)(x)=6x-13 maka f(3)=....

masukin rumus gx ke rumus fogx
f 2x - 5 = 6x - 13
f 2x = 6x - 8
fx = 3x - 4
maka f(3)
= 3(3) - 4
= 9 - 4
= 5

(fog)(x) = 6x - 13
2 . f(x) - 5 = 6x - 13
2 . f(x) = 6x - 13 + 5
2 . f(x) = 6x - 8
f(x) = (6x - 8)/2
f(x) = 3x - 4

Maka ↓↓↓
f(x) = 3x - 4
f(3) = 3(3) - 4
f(3) = 9 - 4
f(3) = 5