Question

O vértice da parábola y= -2x²+8x-8 tem coordenadas
a) (0,-8)
b) (1,-2)
c) (2,0)
d) (3,0)
e) (3,-2)

Answer 1

f(x)=-2x²+8x-8=ax²+bx+c   ==>a=-2,b=8 e c=-8

Vértice=(vx,vy)

vx=-b/2a=-8/(-4)=2

vy=-Δ/4a=-[b²-4*a*c]/4a=-[64-64]/4=0    Letra C