Respostas

2014-08-20T18:34:41-03:00
8x² + 7x = 3x² + 2x
8x² - 3x² = 2x - 7x
5x² = -5x
5x² + 5x = 0
5x(x + 1) = 0
5x = 0 => x = 0
x + 1 = 0
x = -1
S = {-1, 0}