Respostas

2014-05-11T13:42:52-03:00
X²+9x+8=0
Δ=b²-4ac--->9²-4*1*8--->81-32=49 ---> Δ>0 (teremos duas raízes reais distintas)
X=-b ±raiz de Δ/2a----> -9±7/2
x1=-9+7/2=-2/2= -1
x2=-9-7/2=-16/2= -8 :)