• #### Square Matrices

##### PrecalculusSystems of Linear Equations and Matrices

How to determine whether two matrices can be multiplied, and if so, what the dimensions of the product will be.

matrices rows columns dimension matrix multiplication
• #### Introduction to Matrices

##### Algebra 2Matrices

matrix dimensions element row column
• #### Augmented Matrices

##### Algebra 2Matrices

How to use matrices to solve a system of linear equations.

augmented matrix row operations scalar multiple
• #### Adding and Subtracting Complex Numbers

How to add and subtract complex numbers.

• #### Solving Systems using Matrices

##### AlgebraSolving Systems of Equations

How to use matrices to solve a system of equations.

matrix coefficient matrix inverse matrix system of equations

##### Pre-AlgebraWhole Numbers

Using the number line to represent adding and subtracting whole numbers

• #### Adding and Subtracting Polynomials

##### Pre-AlgebraPolynomials

Adding and subtracting polynomials with pictures or aligning vertically

• #### Matrix Operations

##### Algebra 2Matrices

How to use simple matrix operations.

adding matrices scalar multiple matrix matrices
• #### Invertible Square Matrices and Determinants

##### PrecalculusSystems of Linear Equations and Matrices

How to determine whether a square matrix is invertible using its determinant.

square matrices invertible determinant zero determinant inverse of a 2x2 matrix
• #### Adding and Subtracting Rational Expressions

##### Algebra 2Rational Expressions and Functions

How to add and subtract rational expressions.

rational expressions adding subtracting lcd least common denominator factoring
• #### The Inverse of a Square Matrix

##### PrecalculusSystems of Linear Equations and Matrices

How to determine whether two matrices are inverses.

matrices square matrices the identity matrix matrix multiplication invertible inverse matrix
• #### Adding/Subtracting Fractions- Like Denominators

##### Pre-AlgebraFractions and MIxed Numbers

Adding and subtracting fractions that have the same denominator, including a visual representation

• #### Adding/Subtracting Fractions- Unlike Denominators

##### Pre-AlgebraFractions and MIxed Numbers

Drawing pictures and procedures for adding or subtracting fractions with unlike denominators

##### PrecalculusVectors and Parametric Equations

How to add vectors geometrically two ways.

• #### Adding and Subtracting Polynomials

##### AlgebraPolynomials

How to add or subtract polynomials.

simplify combine like terms

• #### Adding and Subtracting Rational Expression

##### AlgebraRational Expressions and Functions

How to add or subtract rational expressions.

common denominator excluded value
• #### The Identity Matrix

##### PrecalculusSystems of Linear Equations and Matrices

How to determine the identity matrix of order n.

matrices square matrices the identity matrix matrix multiplication
• #### Matrix Multiplication

##### Algebra 2Matrices

How to multiply matrices.

matrix multiplication dimensions
• #### 2x2 Determinants

##### PrecalculusSystems of Linear Equations and Matrices

How to compute the determinant of a 2x2 square matrix.

square matrices determinant 2x2 determinant