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INSTRUCTORS Carleen Eaton Grant Fraser

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For more information, please see full course syllabus of Algebra 2
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Quadratic Formula and the Discriminant

  • The quadratic formula can be used to solve anyquadratic equation.

  • If you do not see an easy way to factor a quadratic equation, use the formula.

  • If the discriminant is positive, the equation has 2 real roots.

  • If the discriminant is 0, it has one rational root.

  • If the discriminant is negative, it has two complex conjugate roots.

Quadratic Formula and the Discriminant

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Quadratic Formula 0:37
    • Example
  • One Rational Root 3:10
    • Why It Works
    • Repeated/Double Root
  • Complex Solutions 4:31
    • Example
  • Discriminant 7:19
    • Discriminant Value and Root Type
  • Lecture Example 1 12:08
  • Lecture Example 2 14:15
  • Additional Example 3
  • Additional Example 4