(fog) (x) = 3x+6, g(x) = x+4. Fungsi f(x) =

langsung aja y

(fog)(x) = f{g(x)}

3x + 6 = f(x+4)

Misal :
x + 4 = a
x = a-4

soal menjadi
f(a) = 3(a-4) + 6
f(a) = 3a - 12 + 6
f(a) = 3a - 6

f(x) = 3x - 6

semoga berguna +_+