Lesson: Three-by-Three Determinants Mathematics

In this lesson, we will learn how to evaluate 3 × 3 determinants using the cofactor expansion (the Laplace expansion) or the rule of Sarrus.

Lesson Plan

Students will be able to

  • define minors and cofactors in a matrix,
  • use the cofactors method (Laplace expansion) to evaluate a 3×3 determinant,
  • use the Sarrus method to evaluate a 3×3 determinant.

Lesson Video

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15:14

Lesson Explainer

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