January 13, 2012
Math 521A:
- Tests were passed back and reviewed.
- Continued to work on matrix multiplication. Two observations were made:
1) in order to multiply to matrices, the #of columns in the first matrix must equal the number of rows in the second.
2) If two matrices can be multiplied, the dimensions of the answer can be found using the number of rows of the first matrix and the number of columns of the second matrix.
- Homework: Complete #19 on page 10 and #21 on pages 11 – 12
Math 621B:
- Exercises 25 – 31 p. 168 were corrected.
- Exercises 32, 34, 35, 36, 39, 40, 41 were assigned and corrected.
- Introduced solving quadratic systems. Gave example 4x^2 + y^2 = 25 and 2x + y = -1 and, for homework, you are to finish it. Also, work on journals that are due at the end of next week.
Math 621A:
- Questions with homework exercises were addressed
- Normal approximation to binomial distributions were discussed and examples were completed.
- Homework: Complete exercises 2, 4, 5, 7 on sheet 8.7 (reverse of sheet 8.5/8.6)
