In this lecture you will learn about the Identity Matrix and Inverse Matrix. Starting with the Identity Matrix and moving into Matrix Inverses, our instructor completes the lecture with an example of the Inverse of a 2x2 Matrix before the four extra video examples.
matrix plays the role of the identity under multiplication.
The inverse of a
matrix represents the inverse under multiplication.
A square matrix
has an inverse if and only if its determinant is not zero.
The inverse of a 2
x 2 determinant can be calculated using a specific formula.
Identity and Inverse Matrices
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.