Respostas

2014-02-05T14:32:46-02:00
Δ=2²-4.1.(-8)
Δ= 4+32
Δ=36

x= ( -2 +/- √36) / 2
x= (-2 +/- 6) / 2
x = (-2 + 6)/2 = 2    e     x = (-2-6)/2 = -4

X = 2 e -4