1. Bell Quiz

2. Objectives Simplify and evaluate expressions containing variables.

3. Evaluating Expressions To evaluate an expression that contains variables: – substitute each variable in the expression with a given numeric value. –Then find the value of the expression

4. Example 1 Evaluating Expressions with Two Variables Evaluate each expression for the given values of the variables. – a[– a(p – a)] for a = 3 and p = 4

5. Example 2 Evaluating Expressions with Two Variables Evaluate each expression for the given values of the variables. (– x + a) – (x – a) for a = – 2 and x = 7

6. Lesson Practice Evaluate each expression for the given values of the variables. ax[– a(a – x)] for a = 2 and x = – 1

7. Lesson Practice Evaluate each expression for the given values of the variables. – b[– b(b – c) – (c – b)] for b = – 2 and c = 0

8. Example 3 Evaluating Expressions with Three Variables Evaluate each expression for the given values of the variables. (yx)(zyx) for x = 2, y = –1, and z = 4

9. Example 4 Evaluating Expressions with Three Variables Evaluate each expression for the given values of the variables. x(4ap) xp for a = 1, p = 5, and x = –3

10. Lesson Practice Evaluate each expression for the given values of the variables. (5y)(2z)4xy for x = 3, y = – 1, and z = ½

11. Lesson Practice Evaluate each expression for the given values of the variables. 4rs 6st for r = – 1, s = – 3, and t = –2

12. Example 5 Simplifying Before Evaluating Expressions Simplify each expression. Then evaluate it. – x(y – 3) + y for x = 0.5 and y = – 1.75

13. Example 6 Simplifying Before Evaluating Expressions Simplify each expression. Then evaluate it. x(x + 2y) – x for x = 1\2 and y = 1\4

14. Lesson Practice Simplify each expression. Then evaluate for a = 2 and b = – 1 – b(a – 3) + a

15. Lesson Practice Simplify each expression. Then evaluate for a = 2 and b = – 1 – a(– b – a) – b

16. Example 7 Evaluate each expression for the given values of the variables Evaluate each expression for the given values of the variables. If m = – 2 and y = 2.5, what is the value of ym 3

17. Example 8 Evaluate each expression for the given values of the variables Evaluate each expression for the given values of the variables. If a = 3 and b = – 1, what is the value of 2() __a__ 5 – b 2

18. Lesson Practice Evaluate each expression for the given values of the variables. If a = 3, what is the value of │(– a) 3 │

19. Example 9 Evaluate each expression for the given values of the variables. If a = – 2 and b = 25, what is the value of – b(a – 4) + b b

20. Lesson Practice Evaluate each expression for the given values of the variables. If x = – 4 and y = – 2, what is the value of x3x3 x 2 – x│y│

21. Example 10 Application (Skip)

22. Lesson Practice (Skip)