Parabola and the x-Axis

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Drag the vertex and the width of a parabola and watch the points where it meets the x-axis (the real roots of the quadratic equation) change together with the discriminant D, including the moment two roots merge into a double root and become imaginary. Choose an inequality sign to see the solution of the quadratic inequality on a number line.

Key conceptsquadratic equation · quadratic function · discriminant · real roots · imaginary roots · double root · quadratic inequality

• Algebra & Functions