jika g(x)=x+1 dan(fog)(x)=x^2+3x+1. maka f(x)=

g(x)=x+1
g^-1(x)=x-1

masukan g invers ke fungsi fog
f(x)=(x-1)^2 +3(x-1) +1
= x^2 - 2x + 1 + 3x -3+1
= x^2 + x - 1

semoga mmbantu