f(x)=3x+5 dan g(x)=7-2x (fog)(3) ?

(fog)(x) = f(g(x)
= f(7 - 2x)
= 3(7 - 2x) + 5
= 21 - 6x + 5
= -6x + 26

(fog)(3)
= -6(3) + 26
= -18 + 26
= 8