**Learning objectives**

- Compute determinants of square matrices using row operations
- Relate determinants to invertibility of matrices

**Before class**

- Read Lay sections 3.1, 3.2
- Consult notes to the textbook (if you wish)
- Ponder Lay problems 3.1: 3, 9, 10, 37; 3.2:1-4, 5, 6, 15-20, 24.
- Post to Piazza
- Write solutions to problems 1.8: 20, 22, 30; 1.9: 8, 24; 2.1: 16, 18; 2.2: 8, 22; 2.3: 18, 20 to turn in at the beginning of class

**In class**