What are the possible number of zeros a parabola can have?

All parabolas must have two, but they can either have 2 real solutions, 1 real solutions, or none. A real solution is where it crosses the x axis. If it touches the axis, it is a double zero, there is 1 real solution, and it is the same number. 2 solutions will have it cross the x axis twice, and no solutions means that the root is an imaginary number