Question 867180
y = x^2 - 4, Parabola V(0,-4) x = 0 Line of symmetry
(2,0) and (-2,0) on the curve 
{{{drawing(300,300,   -6, 6, -6, 6, grid(1), 
circle(0, -4,0.2),
circle(2, 0,0.2),
circle(-2, 0,0.2),
graph( 300, 300, -6, 6, -6, 6,0,x^2 - 4 ) )}}}