Question

Efectua
(x + 1)(x + 2) - (x + 3)2 + (x - 3)2 - (x - 4)(x - 5)​

Answer 1

Distribute:

=(x)(x)+(x)(2)+(1)(x)+(1)(2)+−2x+−6+(x)(2)+(−3)(2)+−x^2+9x+−20

=x^2+2x+x+2+−2x+−6+2x+−6+−x^2+9x+−20

Combinar términos comunes:

=x2+2x+x+2+−2x+−6+2x+−6+−x^2+9x+−20

=(x^2+−x^2)+(2x+x+−2x+2x+9x)+(2+−6+−6+−20)

=12x+−30

solución:

=12x−30