Lesson Plan: Three-by-Three Determinants Mathematics • First Year of Secondary School

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This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to evaluate 3 × 3 determinants using the cofactor expansion (the Laplace expansion) or the rule of Sarrus.

Objectives

Students will be able to

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

Prerequisites

Students should already be familiar with

determinants.

Exclusions

Students will not cover

determinants of and higher-dimensional matrices,
properties of determinants.

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