Respostas

2014-07-22T15:45:12-03:00
X² + 4x - 5 = 0
a) 1  b) 4  c) - 5
Δ = b² - 4ac
Δ = 4² - 4 * 1 * ( - 5)
Δ = 16 + 20
Δ = 36

x1 = (- b  + √Δ) / 2a
x1 = -4 + 6 / 2
x1 = 1

x2 = -4 -6 / 2
x2 = - 5