Respostas

2014-06-04T13:36:38-03:00
-4x-12=0
-4x=12
x=-3

Δ= b²-4ac                  vc vai utilizar a formula de baskara
-7²-4.(-1).12 =1

x1= 7-1/2=6/2=3
x2= 7+1/2=8/2=4
1 4 1