Question

as coordenadas do vértice da função y = x - 2x - 3

Answer 1

Xv=-b/2.a
Xv=+2/2
xv=1

yv=-Δ/4.a
yv=-16/4
yv= -4

Δ=b²-4.a.c
Δ=-2²-4.1.-3
Δ=4+12
Δ=16

x=+2 ± √16
       2.1
x=2 ± 4
      2
x¹=6/2=3
x²=-2/2=1

v=(1,-4)