I am given a circle described by the equation below. Is there any way I can bring it to the form $(x-a)^2 + (y-b)^2 = c^2$ to have it be normal? My intent is to translate it to polar coordinates and I think I'd get much nicer results if I could normalize the equation.
$(x^2 + y^2)^2 = 9(x^2 - y^2)$