Respostas

2013-10-01T18:23:24-03:00
X² + 2x-3 = 2
x² + 2x - 5 = 0
Δ = 2² - 4.1.(-5) = 24
x = (-2 ± √24)/2

x' = (-2 - √24)/2
x'' = (-2 + √24)/2