Harvey (1950) is a film starring Jimmy Stewart as Elwood P. Dowd. In the film, Dowd's best friend is a six-foot tall invisible rabbit named Harvey. Harvey is actually a pooka[?], a mischievous magical creature.
... means that the parabola intersects the x-axis in two points.)
If the discriminant is negative, then there are two different solutions x, both of which are complex ...