In video I explain what we mean by roots and the discriminant of a quadratic equation.

How the discriminant tells us how many roots a quadratic equation has and the relationship of a quadratic graph to the number of roots based on how it cuts the x-axis.

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Nature of Roots for a Quadratic Equation (Discriminant) : ExamSolutions Maths Revision

Common types of questions on the discriminant

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Examples on the Nature of Roots of a Quadratic Equation : ExamSolutions