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Master 3x3 Matrix Determinants: General & Shortcut Methods

Linear Algebra: Master Core Concepts & Applications

Linear Equations with Matrices

Row reduction and echelon forms

Linear combination and vector equations in \(R^n\)

Matrix equation Ax=b

Solution sets of linear systems

Application of linear systems

Solving systems of linear equations by graphing

Notation of matrices

The three types of matrix row operations

Representing linear system as a matrix

Representing a linear system as a matrix

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Solving a linear system with matrices using Gaussian elimination

Linear Transformation

Linear independence

Image and range of linear transformations

Properties of linear transformation

The matrix of a linear transformation

Matrix Operations

Adding and subtracting matrices

Multiplying a matrix by a scalar

Multiplying a matrix by another matrix

Matrix multiplication

Zero matrix

Identity matrix

Properties of matrix addition

Properties of matrix scalar multiplication

Properties of matrix to matrix multiplication

Properties of matrix multiplication

Inverse of Matrices

The invertible matrix theorem

The inverse of a 2 x 2 matrix

The inverse of a 3 x 3 matrices with matrix row operations

2 x 2 invertible matrix

Solving linear systems using 2 x 2 inverse matrices

Subspace of \(\Bbb{R}^n\)

Properties of subspace

Column space

Null space

Dimension and rank

Determinant of a Matrix

Properties of determinants

The determinant of a 2 x 2 matrix

The determinant of a 3 x 3 matrix (General & Shortcut Method)

Solving linear systems using Cramer's Rule

Solving linear systems using Cramer"s Rule

Cramer"s Rule with 2 x 2 matrices

Eigenvalue and Eigenvectors

Eigenvalues and eigenvectors

The characteristic equation

Diagonalization

Complex eigenvalues

Discrete dynamical systems

Orthogonality and Least Squares

Inner product, length, and orthogonality

Orthogonal sets

Orthogonal projections

Least-squares problem

Applications to linear models

Parent Assignments

Challenge Zone

Foundation Review

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Intro

Ex.1

Finding a 3x3 determinant using the general (cofactor expansion) method

Ex.2

Finding the determinant of a 3x3 matrix using cofactor expansion

Ex.3

Ex.4

Computing a 3x3 determinant using the shortcut (diagonal) method

Ex.5

Finding a 3x3 determinant using the shortcut method

Ex.6

Using the shortcut method to find a 3x3 determinant with zeros

General method for finding the determinant of a 3x3 matrix

Shortcut method for finding a 3x3 matrix determinant

In this section, we will learn the two different methods in finding the determinant of a 3 x 3 matrix. Instead of memorizing the formula directly, we can use these two methods to compute the determinant. The first method is the general method. This method requires you to look at the first three entries of the matrix. For each entry, you want to multiply that entry by the determinant of a 2 x 2 matrix that is not in that entry's row or column. Note that you have to put a negative sign on the second entry. Then you add everything up, and that will be the determinant of the 3 x 3 matrix. The second method is a shortcut. Watch the video to have a clear explanation of how it works.