January 18, 2012
Math 521A:
- Discussed how to find the inverse of a matrix found on pages 28 – 30 of your workbook.
- #54 on page 29 was completed by finding the inverse using the formula and checking your result by multiplying The original by the inverse to see if the identity was the result.
- #56 on pages 29 – 30 was assigned and corrected as well. Your job here was to determine of the inverse existed and, if so, to find it.
- Solving systems of linear equations using matrices was introduced and will be further discussed tomorrow.
- Homework: Complete the journal that is due by the end of the day tomorrow.
Math 621A:
- Assignment was handed back and reviewed.
- Started trigonometry by discussing periodic functions and how to find the period. WE completed #8 on page 162.
- Homework: Study for tomorrow’s test.
Math 621B:
- Started the final unit on Combinatorics.
- Discussed the Fundamental Counting Principle on pages 334 – 337 and completed the odds 1 – 7 on page 336 – 337.
- Permutations were the next topic on pages 338 -343. I defined permutations, gave an example, discussed factorial notation, and started to explore permutations involving repetition. Tomorrow, we will complete some problems involving permutations.
- Homework: Work on journals that are due on Friday.
