y = a(x - h)^2+ k
implies that y - k = a(x - h)^2,
or Y = aX^2,
which is an equation of the parabola whose ...
A parabola is a conic section of eccentricty one. It is an open curve, meaning that it does not enclose an area. The equation of a parabola can yield significant clues about the shape and location of the parabola instead of plotting the parabola. This problem demonstrates this idea by means of a simple case.