Respostas

2014-08-06T11:34:55-03:00
Olá, Marcioguttierres!

3x² - 9 = 0
a = 3
b = 0
c = -9

Δ = b² - 4ac
Δ = 0² - 4.3.(-9)
Δ = 0 + 108
Δ = 108