Respostas

2014-05-12T14:40:08-03:00
X= -b+- √b^2-4.a.c/ 2.a

x= 1+- √1-4.1.(-12) /2.1
x= 1+- √49 /2
x= 1+- 7 /2

xI= 1+7/2 
xI= 8/2   xI=4

xII=1-7/2 
xII= -6/2     xII=-3