1. Factoring expressions
Section 5.8

2. Find the GCF of Monomials
A __________ is a number, a variable, or a product of a number and one or more variable.
Monomials
Not Monomials
25, x, 40x
x + 4, 40x + 120

3. Find the GCF of Monomials
To _________ a number means to write it as a product of its factors.
A monomial can be factored using the same method you would use to factor a number.
The _______ of two monomials is the greatest monomial that is a factor of both.

4. Examples Find the GCF of each pair of monomials. 1. 12, 28c
2. 25x, 15xy
3. 42mn, 14mn

5. Factor Linear Expressions
You can use the __________ Property and the work backward strategy to express a linear expression as a product of its factors.
A linear expression is in ____________ form when it is expressed as the product of its factors.
Example:
8x + 4y
= 4(2x) + 4(y)
The GCF of 8x and 4y is 4
= 4 (2x + y)
Distributive Property

6. Examples
Factor each expression. If the expression cannot be factored, write cannot be factored.
4. 4x – 28
5. 3x + 33y
6. 4x + 35

7. You Try Find the GCF of each pair of monomials 1. 32x, 18 2. 27s, 54st
3. 18cd, 30cd

8. You Try
Factor each expression. If the expression cannot be factored, write cannot be factored.
4. 36x + 24
5. 4x + 9
6. 14x – 16y

9. Word Problem
Mr. Phen’s monthly income can be represented by the expression 25x where x is the number of hours worked. Factor the expression 25x

10. Essential Question
Explain how the GCF is used o factor an expression. Us the term Distributive Property in your response.
__________________________________________________________________________________________________________________________________________________________________________________________________________________