A graph of an equation in the form y = ax^2 + bx + c will cross the y-axis once - whatever its discriminant may be.
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The graph will cross the y-axis once but will not cross or touch the x-axis.
If the discriminant is negative, the equation has no real solution - in the graph, the parabola won't cross the x-axis.
It will touch it once.
Once.
Once and the roots are said to be equal.