Respostas

2014-06-26T16:25:45-03:00
2014-06-26T16:26:12-03:00
5x² - 3x - 2 = 0

Δ = (-3)² - 4(5)(-2)
Δ = 9 + 40
Δ = 49

x = [-(-3) +/- √49]/[2(5)]

x' = [-(-3) + √49]/[2(5)]
x' = [3 + 7]/[10]
x' = [10]/[10]
x' = 1

x'' = [-(-3) - √49]/[2(5)]
x'' = [3 - 7]/[10]
x'' = [-4]/[10]
x'' = - 0,4