Respostas

2013-08-04T13:52:45-03:00
A) Xv formula 
Xv=-b/2a
Xv=-10/2
Xv=-5

x² + 10xa= 1, b=10 e c=0
delta = (10)elevado a 2 - 4.(1).(0)
delta= 100-0
delta= 100
b)Yv= -delta/4a
Yv= -100/4=-25