Section 1.6 Multiplication and Division of Real Numbers 69 Skill Practice Simplify. 18. 100 331 12 622 4 020 25 0 Evaluating Algebraic Expressions Example 7 Given y6, evaluate the expressions. a. y2 b. y2 Solution: a. When substituting a number for a variable, use parentheses. Substitute Square , that is, b. y2 1 22 1622 y 6. 36 6 162162 36. When substituting a number for a variable, use parentheses. Substitute Square Multiply by y2 1622 y 6. 1362 6. 36 1. Skill Practice Given a 7 , evaluate the expressions. 19. a2 20. a2 1 22 Answers 18. 11 19. 49 20. –49 Calculator Connections Topic: Evaluating Exponential Expressions with Positive and Negative Bases Be particularly careful when raising a negative number to an even power on a calculator. For example, the expressions 1422 42 1422 16 42 16 and have different values.That is, and .Verify these expressions on a calculator. Scientific Calculator: To evaluate Enter: 4 Result: To evaluate on a scientific calculator, it is important to square 4 first and then take its opposite. Enter: 4 Result: Graphing Calculator: 16 42 16 1422
miller_beginning_intermediate_algebra_4e_ch1_3
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