INSTRUCTORS Carleen Eaton Grant Fraser

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• ## Related Books

 0 answersPost by Emily Engle on January 28, 2014At 10:40 he said negative but then forgot to write it.  You need to change the signs to get the correct answer.

### Identity and Inverse Matrices

• The identity 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.

• Intro 0:00
• Identity Matrix 0:10
• Example: 2x2 Matrix
• Matrix Inverses 4:40
• Example: Does Not Exist
• Inverse of a 2x2 Matrix 8:17
• Example
• Lecture Example 1 13:19
• Lecture Example 2 15:57