Section 1: Simplification of Linear Algebraic Expressions
A 10 minutes quick quiz
1. The distributive law is applicable when removing parentheses in an algebraic expression. Examples in class:
- 2(3x + 4y) =
- -4(5a – 3b) + 7a
- a(2x + 7y + 5z)
- (2p + 3q -4r)(-6b)
- 2[x- 5(3-x)]
2. Express each of the following as a single fraction in the simplest form. Recall LCM of denominators.
- -p + p/3 +(3p)/5
- (3p + 10)/4 -2
- (3x – 4)/4 + (2x+5)/3
- (1 – 2x)/3 + (3x + 1)/5 + (4x -3)/6
3. Home Work:
- Handout:
- two pages
- Workbook: correct last week’s HW problem of
- page 21: 3, 4, 5
- Page 23: 11, 12, 13, 14, 15
- Page 24: 21
- Page 25: 22, 23
Section 2: Factorization by Extracting Common Factors, Factorization by grouping terms
1. The process of writing an algebraic expression as a product of its factors is called factorization or factoring:
- 600 = 2x2x2x3x5x5
- ax + ay = a(x+ y)
- 15a + 20b = 5(3a) + 5(4b)=5(3a + 4b)
- 24ax – 40ay + 8a = (8a)(3x) – (8a)(5y) + (8a)(1) = 8a(3x – 5y + 1)
2. Factorization by grouping
- 12ax – 3ay + 8bx -2by
= (12ax -3ay) + (8bx -2by)
= 3a(4x-y) +2b(4x -y)
=(3a + 2b)(4x-y)
- 49a + 42c -7ay -6cy
= (49a -7ay) + (42c – 6cy)
= 7a(7 – y) + 6c(7 – y)
= (7a + 6c)(7 – y)
3. Home Work:
- Handout:
- two pages
- Workbook:
- page 22: 7, 8
- Page 24: 16, 17, 18, 20
- Page 26: 26, 27, 28, 29