1. 7.2 Simplifying Expressions
Objective: Students will demonstrate they know the parts of an expression and how to combine like terms.

2. Definitions Parts of Expression Term: parts of an expression.
Coefficient: number in front of variable.
Constant term: term with no variable
Like terms: terms with same variable parts.

3. Identifying Parts Given the expression. 5x + 4x + 7
Identify the terms, coefficients, like terms, and constant terms.
5x + 4x + 7
Constant
Term = 7
Like Terms
5x, 4x
Terms:
5x, 4x, 7
Coefficients
5, 4

4. Teacher Examples
For the following, Identify the terms, like terms, constant terms, and coefficients.
6x2 + 5x – 4x + 7

5. Identify the terms, like terms, coefficients, and constants
14x x
5y + 23 – y – 6

6. Simplifying Expressions
Note: to simplify combine like terms!
Ex: 6x + 5x – 7 + 8
5x + 2x
41c2 – 4c2 + 2c2
8b – 9b

7. Student Examples 2c + 2 – (c + 2) 11y – 3(6 – y) 9n - (6n – 6)
5(d + 3) + 7d
2c + 2 – (c + 2)
9n - (6n – 6)

8. Finding Perimeters
Perimeters: add all sides 8x
3x + 4

9. Student Examples
Find the perimeter.
7x + 3 4x
8x - 2

10. Wrap-up
Questions/Comments
Hw: worksheet

11. Do the following 3x – 4x + 5 – 7 Terms: Like Terms: Constants:
With the expression below state the following: Like terms, constants, terms, coefficients, and simplify.
3x – 4x + 5 – 7
Terms:
Like Terms:
Constants:
Coefficients:
Simplified: