Respuesta :
y = (7x-2x)(5x+2)
y= (7x.5x)+(-2x.5x)+(2.7x)+(-2x.2)
y= 35x^2 + (-10x^2) +(14x)+(-4x)
y= 25x^2+10x
y= (7x.5x)+(-2x.5x)+(2.7x)+(-2x.2)
y= 35x^2 + (-10x^2) +(14x)+(-4x)
y= 25x^2+10x