Respuesta :

Answer:

Step-by-step explanation:

(x+1)(x−3)(x−4)

=((x+1)(x−3))(x+−4)

=((x+1)(x−3))(x)+((x+1)(x−3))(−4)

=x3−2x2−3x−4x2+8x+12

=x3−6x2+5x+12