Respostas

2013-03-07T22:21:49-03:00

x² - 4x+5=0
delta : (-4)²-4.(1).(5) = 16-20 = -4
x = [-(-4)+-raiz(delta)]/[2.(1)]
x = (4+-raiz(-4))/2
x = 2+-raiz(-1)
Resposta:
x = 2+i ou x=2-i

24 4 24