Question

9) Efetue as multiplicações e simplifique
a) (x - 1) x (x + 1)
b) (2x + 3) x (x + 4)
c) (a - 2x) x (3x + a)
d) (xy + 2z) x (xy-22)​

Answer 1

Resposta:

a) $(x-1)\times (x+1) = x^2+x-x-1 = \boxed{x^2 -1}$

b) $(2x+3)\times (x+4) = 2x^2+8x+3x+12= \boxed{2x^2+11x+11}$

c) $(a-2x)\times (3x+a) = 3ax+a^2-6x^2-2ax = \boxed{a^2-6x^2+ax}$

d) $(xy+2z)\times (xy-22) = x^2y^2-22xy+2xyz-44z = \boxed{x^2y^2-22xy+2xyz-44z}$

Explicação passo-a-passo: