dik f (x) =3x g(x) =2-5x Dit= (fog) ¹(x)...?

fog(x) = 3(2-5x)=6-15x
fog(x) =6-15x
y =6-15x
15x =y+6
x =(y+6)/15
fog^-1(x)=(x+6)/15

jadi fog^-1=(x+6)/15