Respostas

2013-11-11T08:56:00-02:00
XV = -b/2a = -20/2.10 = -20/20 = -1
yV = -delta/4a = -(20²-4.10.40)/4.10 = -(400-1600)/40 = -(-1200)/40 = 30
V = (-1; 30)