Question

•(b+3)(b+4)=
•(X+y)(X+z)=

Answer 1

1) (b+3)(b+4) [b multiplica a +3 y +4, luego 3 multiplica +b y +4]
(b+3)(b+4)= b x b + 4 x b + 3 x b + 3 x 4
= b^2+4b+3b+12
= b^2+7b+12

b^2 (b al cuadrado)

2) (x+y)(x+z)
x^2+xz+yx+yz