Page 121

miller_prealgebra_2e_ch1_3

Section 2.5 Order of Operations and Algebraic Expressions 119 Evaluating an Algebraic Expression Example 9 Evaluate the expression for the given values of the variables. Solution: Replace the variables with empty parentheses. Substitute 9 for x, 4 for y, and 2 for z. Simplify inside absolute value bars first. Rewrite subtraction in terms of addition. Add within the absolute value bars. Evaluate the absolute value before multiplying. 5 0x y z 0 5 0 1 2 1 2 1 2 0 5 0 192 142 122 0 5 09 4 2 0 5 03 0 5 3 15 5 0x y z 0 , for x 9, y 4, and z 2 TIP: Absolute value bars act as grouping symbols. Therefore, you must perform the operations within the absolute value first. 3 a b 4 for Answer 16. 10 Study Skills Exercise When you take a test, go through the test and do all the problems that you know first. Then go back and work on the problems that were more difficult. Give yourself a time limit for how much time you spend on each problem (maybe 3 to 5 minutes the first time through). Circle the importance of each statement. Not Somewhat Very important important important a. Read through the entire test first. 1 2 3 b. If time allows, go back and check 1 2 3 each problem. c. Write out all steps instead of doing 1 2 3 the work in your head. Review Exercises For Exercises 1–8, perform the indicated operation. 1. 7 0 2. 0 172 3. 100 142 4. 100 142 5. 100142 6. 100 142 7. 11222 8. 122 Skill Practice 16. Evaluate the expression for the given value of the variable. a 5 and b 12 Section 2.5 Practice Exercises


miller_prealgebra_2e_ch1_3
To see the actual publication please follow the link above