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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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  • A determinant is a value associated with a square matrix.

  • Third-order determinants can be evaluated by expanding by minors along any row or column of the associated matrix.

  • These determinants can also be found by calculating products of entries along the diagonals and then adding and subtracting these products.


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
  • What is a Determinant 0:15
  • Determinant of a 2x2 Matrix 0:56
    • Difference from Matrices
    • Second Order Determinant
    • Example
  • Determinant of a 3x3 Matrix 3:20
    • Third Order Determinants
    • Origin of Equation (Minors)
    • Expansion by Minors
    • Example: 3x3 Matrix
  • Diagonal Method for 3x3 Matrix 12:45
    • Example
  • Lecture Example 1 17:03
  • Lecture Example 2 17:42
  • Additional Example 3
  • Additional Example 4