Session Overview
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Now we start to use the determinant. Understanding the cofactor formula allows us to show that A-1 = (1/det_A_)_CT_, where _C_ is the matrix of cofactors of _A_. Combining this formula with the equation x = A-1b gives us Cramer’s rule for solving _A_x = b. Also, the absolute value of the determinant gives the volume of a box.
Session Activities
Lecture Video and Summary
- Watch the video lecture
- Read the accompanying lecture summary (PDF)
- Lecture video transcript (PDF)
Suggested Reading
- Read Section 5.3 in the 4th or 5th edition.
Problem Solving Video
- Watch the recitation video on
- Recitation video transcript (PDF)
- 观看视频: 习题讲解 – [watch this recitation in Mandarin]
Check Yourself
Problems and Solutions
Work the problems on your own and check your answers when you’re done.