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    Parabolas and Complex Roots

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    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 origin itself, the two points are coincident,

    But what if the roots are complex? How many times would the graph cross the x-axis.

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    Solution Preview

    Such a parabola is not possible in the real plane. If you can draw the parabola on x-y plane, it should have two real roots.

    I am not quite understanding ...

    Solution Summary

    Parabolas and complex roots are discussed in the solution.