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Do Now 9/7/10 Copy HW in your planner. Text p. 5-7, #4-52 multiples of 4 In your journal, answer the following question. How do you evaluate algebraic expressions and powers? Then solve the example, when n = 4. 14 n Objective SWBAT evaluate algebraic expressions and use exponents Section 1.1 “Evaluate Expressions” VARIABLE a letter used to represent one or more numbers. To EVALUATE AN ALGEBRAIC EXPRESSIONsubstitute a number for each variable, perform the operations and simplify, if necessary. 13 n = 13 3 = 39 Substitute 3 for n. Multiply. Evaluate the expression when n = 3. a. b. 9 n = 9 3 Substitute 3 for n. = 3 Divide. n–1 = 3–1 = 2 Substitute 3 for n. Subtract. Evaluate the expression when y = 2. c. 6 y = 6 2 = 12 Substitute 2 for y. Multiply. d. y + 4 = 2+4 = 6 Substitute 2 for y.. Add. POWER an expression that represents repeated multiplication. 2 4 EXPONENT BASE Product 2222 Words two to the fourth power GUIDED PRACTICE Evaluate the expression. 1. x3 when x = 8 1. 2. k3 when k = 2.5 x3 = 83 =8 8 8 = 512 3. d4 when 2. k3 = 2.53 = (2.5)(2.5)(2.5) = 15.625 3. d4 = 1 3 4 ( ) 1 = 3 = 1 81 1 3 1 3 1 3 d= 1 3 Homework Text p. 5-7, #4-52 multiples of 4 D105 Classroom Scavenger Hunt