main/src/georegression/geometry/UtilEllipse_F64.java
public static double evaluate( double x , double y , EllipseQuadratic_F64 ellipse ) {
		return ellipse.A *x*x + 2*ellipse.B *x*y + ellipse.C *y*y + 2*ellipse.D *x + 2*ellipse.E *y + ellipse.F;
	}
public static double evaluate( double x , double y , EllipseQuadratic_F64 ellipse ) {
		return ellipse.A *x*x + 2*ellipse.B *x*y + ellipse.C *y*y + 2*ellipse.D *x + 2*ellipse.E *y + ellipse.F;
	}
Computes the value of the quadratic ellipse function at point (x,y). Should equal 0 if the point
is along the ellipse.

@param x x-coordinate
@param y y-coordinate
@param ellipse Ellipse equation being evaluated.
@return value of ellipse equation at point (x,y)