Respostas

2013-12-02T09:25:36-02:00
A)=0
b)=x=3*(-2)
x=-6
c)=
x²-2x-1

a=1
b=2
c=-1

delta = b²-4 ac
 = (-2)² -4.1.(-4)
 = 4+4
 = 8

x= -b+ou- raiz delta /2a