Ch 1.2 Objective: To simplify expressions using the order of operations.

Order of Operations (PEMDAS) The Order of Operations are rules that explain how to evaluate mathematical expressions. Parenthesis Exponents Multiplication & Division Addition & Subtraction

Example This is WRONG! 1 * * 4 = * 4 = 5 * 4 = 20 Multiply – Add – Multiply NO! This is CORRECT! 1 * * 4 = = 14 Multiply – Multiply - Add YES!

Order of Operations Parenthesis Exponents 6 + 5(6) = = 77 Multiply / Divide 8 4 = 32 Add / Subtract = 15 1) 6 + 5(8 - 2) 2) 3) 4)

Simplify the following. 1) 2) 3) 4) (4 + 18) (22) = [18 6] [3] = =7 Examples

Classwork Simplify each expression below. 1) 3   5 2) 3) 4) 5) 6)

24 2 2(4 + 8) Evaluate the expression if a = 2, b = 4, and c = 8 5) ab - c 6) 3a(c - b) 7) 8) (2)(4) (2)(8 - 4) 3(2)(4) (2) (4) = (12) 2 == Examples

Classwork 7) 2|a| + |b| 8) 9) 10) 11) 12) Evaluate the expression if a = 5, b = 3, and c = 2