Respuesta :

5(2x+4)
Multiply 5 by 2x and 4
=10x+20

4(3-2x)-4+5x
12-8x-4+5x
8-3x

(x+4)(x-7)
x^2-7x+4x-28
x^2-3x-28

(3x-3)(2x-5)
6x^2-15x-6x+15
6x^2-21x+15
good job