Respostas

2014-03-08T17:09:19-03:00
X^2 + 2x -8 = 0
a = 1
b = 2
c = -8

 delta = b^2 - 4.a.c = 2^2 - 4 .1 . (-8) = 4 + 32 = 36

x' = (-b + raiz de delta) / 2.a = (-2 + raiz de 36) / 2. 1 =( -2 + 6) / 2 = 4/2 = 2
x'' = ( -b - raiz de delta)/2 . a = ( -2 - raiz de 36)/ 2.1 = (-2 -6 )/2 = -8/2 = -4