Respostas

2014-03-07T22:20:42-03:00
A)x²+10x-11=0
Delta=100+44
Delta=144

x=-10±12/2
x'=1
x''=-11
S=(1,-11)


b)-x²+6x-9=0
Delta=36-36
Delta=0
x=-6/-2
x=3
S=(3)
1 5 1