1. Chapter 1: Real Numbers and Equations Section 1.3: Variables and Expressions

2. Goal: to evaluate numerical and algebraic expressions

3. Section 1.3: Variables and Expressions Numerical Expression : A combination of arithmetic operations and numbers Terms: the parts separated by + or – symbols Order of Operations : Used to simplify numerical expressions PEMDAS

4. Section 1.3: Variables and Expressions Example 1: Simplify:

5. Section 1.3: Variables and Expressions Variable : A letter which is used to represent a number or a set of numbers Algebraic Expression: A combination of arithmetic operations, numbers, and variables Evaluate and algebraic Expression : Substitue the given value(s) of the variable(s) then use the order of operations to find the value of the resulting numerical expression

6. Section 1.3: Variables and Expressions Example 2 : Simplify: 4 y 2 – 5 y + 3 (2 – 3 y ) – y 3 ; y = 2 16 – 3 x 2 + 7 x – 3 (2 x – 1) ; x = -3

7. Section 1.3: Variables and Expressions Classwork : Class Exercises: Pg. 15 #3 – 10 (all) Homework : Practice Exercises: Pg. 15 #2 – 26 (even)