Question

as coordenadas do vertice da funçao y=x2-3x-4 sao

Answer 1

Para achar o X do vértice temos :
Xv=-b/2a
Para achar o Y do vértice temos que:
Yv=- ∆/4a logo:
Xv=-(-3)/2.1
Xv=3/2
Yv=9-4.1.-4
9+16=25 --> valor do delta
Yv=-25/4

Answer 2

Xv (x do vértice) = -b/2a = 3/2
Yb (y do vértice) = - Δ/4a = - (b² - 4ac) / 4a = -25/4

Logo as coordenadas do vértice são (3/2; -25/4)