Respostas

2014-04-27T12:33:36-03:00
Δ = b² -4.a.c
Δ =
 (-√2)² - 4.1.(-4) = 2+16 = 18

x1= (√2 + 3√2) / 2 = 4√2 / 2 = 2√2
x2= (√2 - 3√2) / 2 = -2√2 / 2 = -√2
3 4 3