Complete the square to determine whether the equation
represents an ellipse, a parabola, a hyperbola, or a degenerate
conic. If the graph is an ellipse, find the center, foci, vertices, and
lengths of the major and minor axes. If it is a parabola, find the
vertex, focus, and directrix. If it is a hyperbola, find the center,
foci, vertices, and asymptotes. Then sketch the graph of the equation.
If the equation has no graph, explain why.