Resposta :
Yv=-delta/4a
Yv=-(b²-4.a.c)/4a
Yv=-((-6)²-4.(-1)(-5))/4.(-1)
Yv=-(36-20)/-4
Yv=-16/-4
Yv=4 m
Yv=-(b²-4.a.c)/4a
Yv=-((-6)²-4.(-1)(-5))/4.(-1)
Yv=-(36-20)/-4
Yv=-16/-4
Yv=4 m