Respostas

2013-11-27T14:19:57-02:00
-x²-2x+3=0
a=-1
b=-2
c=3
-b+-√b²-4*a*c/2a :::baskara
-(-2)+-√-2²-4*(-1)*3/2*1
2+-√4+4*3/2
2+-√4+12/2
2+-√16/2
2+-4/2
2+4/2=6/2=3
2-4/2=2/2=1