Question

A) (x+7)(x-5)=

B) (x-3)(x-4)=

C) (m-2)(m+2)=

D) (y+4)(y-5)=

E) (x+7)(x+8)=​

Answer 1

Respuesta:

A)(x+7)(x−5)

=(x+7)(x+−5)

=(x)(x)+(x)(−5)+(7)(x)+(7)(−5)

=x2−5x+7x−35

=x2+2x−35

B)(x−3)(x−4)

=(x+−3)(x+−4)

=(x)(x)+(x)(−4)+(−3)(x)+(−3)(−4)

=x2−4x−3x+12

=x2−7x+12

C)(m−2)(m+2)

=(m+−2)(m+2)

=(m)(m)+(m)(2)+(−2)(m)+(−2)(2)

=m²+2m−2m−4

=m²−4

D)(y+4)(y−5)

=(y+4)(y+−5)

=(y)(y)+(y)(−5)+(4)(y)+(4)(−5)

=y2−5y+4y−20

=y2−y−20

E)(x+7)(x+8)

=(x+7)(x+8)

=(x)(x)+(x)(8)+(7)(x)+(7)(8)

=x2+8x+7x+56

=x2+15x+56