dik: f(x)=2x-5 dan g(x)=3+x,tentukan (FoG)(a)=7

f(x)=2x-5, g(x)=3+x
(fog) = f(g(x))= 2(3+x)-5 = 2x+1
(fog)(a) = 7
2x+1(a) = 7
a = 3
Pembuktikan, substitusikan nila a pada x
2x + 1 = 7
2 × 3 + 1 = 7
6 + 1 = 7
7 = 7
Semoga membantu ya...