## Math 6A, Lesson 2, Spring 2018, 2/4/2018

zhenli Post in Teaching Plan

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
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