Fungsi komposisi (fog)(x)=x2-4x+3 tentukan f(x) jika g(x)=x-1

(fog)(x)=f(g(x))=f(x-1)=x2-4x+3
f(x-1+1)=(x+1)2-4(x+1)+3
f(x)=x2+2x+1-4x-4+3
f(x)=x2-2x