Resposta :
1- [tex]Y _{v} = \frac{-b^2-4.a.c}{4.a} [/tex]
[tex]Y _{v} = \frac{20^2}{4.(-5)} [/tex]
[tex]Y _{v} = \frac{-20^2}{20} [/tex]
[tex]Y _{v} =20m[/tex]
2- y=x² -6x+5
xv= -b/2a
yv= -∆/4a
xv= 6/2= 3
∆= b²-4ac
∆=36-4.1.5= 16
yv= -16/4=-4
V(3,-4)
[tex]Y _{v} = \frac{20^2}{4.(-5)} [/tex]
[tex]Y _{v} = \frac{-20^2}{20} [/tex]
[tex]Y _{v} =20m[/tex]
2- y=x² -6x+5
xv= -b/2a
yv= -∆/4a
xv= 6/2= 3
∆= b²-4ac
∆=36-4.1.5= 16
yv= -16/4=-4
V(3,-4)