Jika f(x)=2x-1 dan g(x)=x²+4x, maka goF(x) =

gof(x)=  g { f(x)}

= g { 2x – 1}

= (2x – 1)² + 4(2 x- 1)

=  4x² + 4x + 1 + 8x – 4

=  4x² + 12x   – 3