Respostas

2014-04-24T10:17:12-03:00
(x-2)² + 8x = 4
x² + 4 - 4x + 8x - 4 = 0
x² + 4x = 0
x(x+4) = 0
(1) x = 0 ou
(2) (x+4) = 0 ==> x = -4
resp : 0 ; -4