1. 1.2 Grouping Symbols Objective: To simplify expressions with and without grouping symbols. Warm – up:

2. 1.2 Grouping Symbols A grouping symbol is a device used to enclose an expression that should be simplified first. – Brackets – Parentheses – Fraction Bar If an expression contains more than one grouping symbol, first simplify the expression in the innermost grouping symbol. Then work toward the outermost grouping symbol until the simplest expression is found.

3. 1.2 Grouping Symbols Example: When there are no grouping symbols, simplify in the following order: – All multiplication and division in order from left to right – All addition and subtraction in order from left to right

4. 1.2 Grouping Symbols Examples: These expressions can be evaluated as well. Example: Let x = 3 and y = 8

5. 1.2 Grouping Symbols More Examples: Let x = 1, y = 3 and z = 7.

6. 1.2 Grouping Symbols What is the difference between simplifying and evaluating? Homework: – Pg. 8 Written Exercises #1 – 8, 9 – 27odd