Respostas

2014-07-24T16:38:51-03:00
2 x ² - 6 x - 2 0 = 0
Delta = (- 6)^2 - 4.2.(- 20)
Delta = 36 + 160
Delta = 196

x = 6 + - raiz de 196 / 4
x = 6 + - 14 / 4

x' = 6 + 14 / 4 = 20 / 4 = 5

x" = 6 - 14 / 4 = - 8 / 4 = - 2