Question 913236
x^2-24y-36=0
y =(1/24)x^2 - 3/2  {{{y=a(x-h)^2 +k}}}, a = (1/24) > 0, Opens Upward.
V(0,-3/2), x = 0 Line of Symmetry
{{{drawing(300,300,   -10,10,-10,10,  
 grid(1),
circle(0,-3/2,0.4),
graph( 300, 300, -10,10,-10,10,0, y =(1/24)x^2 - 3/2 ))}}}