Question

Calcule a raiz da equaçao (x-2).(x+4)=2.(x+4)

Answer 1

(x-2).(x+4)=2(x+4)
x^2+4x-2x-8=2x+8
x^2+4x-2x-2x=8+8
x^2+4x-4x=16
x^2=16
x= raiz de 16
x=-/+ 4

Answer 2

(x - 2).( x + 4) = 2(x + 4)
x² + 4x - 2x - 8 = 2x + 8
x² + 2x - 8 = 2x + 8
x² + 2x - 2x - 8 - 8 = 0
x² - 16 = 0
x² = 16
x = √16
x = 4 e x = - 4