The determinant of a 2 x 2 matrix - Inverse of Matrices
The determinant of a 2 x 2 matrix
In this lesson, we will learn how to find a determinant of a 2 x 2 matrix. To find the determinant, we multiply the top left entry and bottom right entry and subtract it with the product of the top right entry and bottom left entry. We will use these determinants later on in the course to show if a matrix is invertible. We will also use it to find inverses of 2 x 2 matrices.
Basic Concepts
- Notation of matrices
Lessons
Notes:
Let the matrix 
, where and are all numbers. We denote the determinant of to be det. To find the determinant of a 2 x 2 matrix we compute the following:
det
