jika f(x) =x²+3x =4 dan g(x) =x-4 , maka (fog)(x) =...

(fog)(x) = f(g(x))=f(x-4)= x^+3x-4
=>(x-4)^+3(x-4) -4
=>x^-8x+16 + 3x-12 -4
=> x^-8x+3x+16-12-4
=> x^-5x+4-4
=> x^-5x