Question 862679
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Hi
y=-2x^2-8x+10
 axis of symmetry x=-b/2a: 
 vertex (-b/2a,y):
 y-intercept (c): (0,10)
 two other points: (1,0) (-5,0)
 Is the Vertex to this problem : (-2,18) Yes!
 Is the axis of symmetry to this problem x=-2 Yes! 
{{{drawing(300,300,   -20,20,-20,20, grid(1),blue(line(-2,20,-2,-20))  ,  
circle(-2, 18,0.4),
graph( 300, 300, -20,20,-20,20,0,-2x^2-8x+10 ))}}}