Question

Y= -2 (x+2)^2-8vertex=?how to graph?

Answer 1

Https://www.desmos.com/calculator you can use this calculator just plug the what y= in it and it will show you the graph and the vertex
 

Answer 2

For
y=a(x-h)^2+k
vertex is (h,k)
a tells about the graph

y=-2(x-(-2))^2-(-8)
vertes ix (-2,-8)

to graph, plot some points
when x=0, then y=-16
(0,-16)
when x=1, then y=
(1,-26
when x=-1, then y=-10
(-1,10)
when x=-3, y=-10
(-3,10)