Diket : f(x)=3x+9 g(x)=2x-3 Dit. : a) f o g(x)= b) g o f (x) =

jawab
fungsi

f(x)= 3x + 9
g(x)= 2x - 3

a) fog(x) =  f {g(x)}
=  f(2x -3)
= 3(2x - 3) + 9
= 6x - 9 + 9
= 6x

b. gof(x) = g { f(x)}
= g { 3x+9)
= 2 (3x+9) - 3
= 6x + 18 - 3
= 6x + 15