Respostas

2014-04-14T19:40:12-03:00
X2+2x-8=0

a= 1
b= 2
c= -8

(Delta)= b2- 4ac
(Delta)= (2)2- 4(1)(-8)
(Delta)= 4+32
(Delta)= 36

X=-b+/- (raiz quadrada de 36)
X= -(2) +/- 6
X= -2 +/- 6
X1= -2+6 = 4*
X2= -2-6= -8*