Fungsi F=R-R di tentukan oleh F(x)=3x+6 dan g(x)=5x^2: a. (GoF) (2) b. (FoG) (1)

jawab

f(x)= 3x + 6
g(x)= 5x²

a. gof(2)=  g { f(2)} = g (3(2) + 6) = g(12)
= 5(12)² = 720

b. fog(1) = f { g(1)} = f (5(1)²) = f(5)
= 3(5) + 6 = 21