How many times does the graph of a quadratic equation (a parabola) cross the x-axis?
I know that the graph of a quadratic equation should cross the x-axis 2 times, because the polynomial equation of second degree should have two roots, however if the vertex of a parabola is the orgin itself, the two points are coincident,
But what if the roots are complex? How many times would the graph cross the x-axis.