x=-b/2a=-b/(-6)=b/6
y=-3b^2/36+b^2/6-3=b^2(1/6-1/12)-3=0
b^2*1/12=3
b^2=36
b=+-6
b=6 (1;0)
b=-6 (-1;0)
x=-b/2a=-b/(-6)=b/6
y=-3b^2/36+b^2/6-3=b^2(1/6-1/12)-3=0
b^2*1/12=3
b^2=36
b=+-6
b=6 (1;0)
b=-6 (-1;0)