Jika f(x) = 4x + 5 dan g (x) = 5x maka (fog) 8 = A. 165 B. 175 C. 185 D. 195 E. 205

[tex](fog)8 = 4(5x) + 5 \\ (fog)8 = 20x + 5 \\ (fog)8 = 20(8) + 5 \\ (fog)8 = 160 + 5 \\ (fog)8 = 165[/tex]

Dik= f(x) = 4x + 5
g(x) = 5x
Dit: (fog) 8 =...?
Peny:
(fog) 8 = 4 (5x) + 5
= 20x + 5
(x nya diganti 8)
=20 (8) + 5
=160 + 5
=165

Jadi, (fog) 8 = 165