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Khan Academy
Khan Academy: Algebra: Discriminant for Types of Solutions for a Quadratic
Explains how to interpret the value of the discriminant to determine the number and types of solutions of a quadratic equation. [4:37]
Khan Academy
Khan Academy: Algebra: Discriminant of Quadratic Equations
Identifies the quadratic formula and discusses what the values of the discriminant indicate about the number and types of solutions for a given quadratic equation. This video also appears in the Algebra: ck12.org strand. [10:14]