Question

determine o vertice f(x)=-3x²-8x-10

Answer 1

formula do vertice 
Vx = -b/2a 
Vy = -Δ²/4a 

função 
f(x) = -x² + 2x + 3 

a = -1 
b = 2 
c = 3 

Vx = -b/2a = -2/-2 = 1 
Δ² = 4 - 4*(-1)*3 = 16 
Vy = -Δ²/4a = -16/-4 = 4 

Answer 2

-3x^2-9x-10=0
delta=b^2-4ac
delta=(-9)^2-4.(-3).(-10)
delta=81-120
delta=-39
xv=-b/2a
xv=-(-8)/2.(-3)
xv=8/-6 (÷2)
xv=-4/3
yv=-delta/4a
yv=-(-39)/4.(-3)
yv=39/-12
yv=-3,25