Respostas

2014-08-06T11:51:04-03:00
Olá, Marcioguttierres!

1) x² - 5x = 0
a = 1
b = -5
c = 0

Δ = b² - 4ac
Δ = (-5)² - 4.1.0
Δ = 25 - 0
Δ = 25

2) x² + 3 = 0
a = 1
b = 0
c = 3

Δ = b² - 4ac
Δ = 0² - 4.1.3
Δ = 0 - 12
Δ = -12