Question

VERTICE DA PARABOLA DE EQUAÇÃO Y=2X²-8X-9

Answer 1

Vértice da parábola=(Xv;Yv)
$Xv= \frac{-b}{2a}$
$Yv= \frac{-Delta}{4a}$

2x²-8x-9
a=2
b=-8
c=-9

Δ=b²-4.a.c
Δ=-8²-4.2.(-9)
Δ=64+72
Δ=136

$Xv= \frac{-(-8)}{2.2}$
$Xv= \frac{8}{4}$
$Xv= 2$

$Yv= \frac{-136}{4.2}$
$Yv= \frac{-136}{8}$
$Yv= -17$

V=(2;-17)