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mgb5e_ppt_1_7

mgb5e_ppt_1_7 - 1.7 Multiplying and Dividing Real Numbers...

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§ 1.7 Multiplying and Dividing Real Numbers

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Martin-Gay, Beginning Algebra, 5ed 2 Multiplying Real Numbers The product of two numbers with the same sign is a positive number. Example : Multiply. –75 × (– 3) –75 × (– 3) = 225 The result will always be positive. Example : Multiply. 5 2 12 3  - -   5 18 = 5 2 5 2 12 3 2 2 3 3  - - =  
Martin-Gay, Beginning Algebra, 5ed 3 Multiplying Real Numbers The product of two numbers with different signs is a negative number. Example : Multiply. – 6(4) – 6(4) = – 24 The result will always be negative. Example : Multiply. 12(– 9) 12(– 9) = – 108

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Martin-Gay, Beginning Algebra, 5ed 4 Zero as a Factor If b is a real number, then b · 0 = 0. Also 0 · b = 0. Example : Multiply. – 6 · 0 – 6 · 0 = 0 Example : Multiply. 0 · 125 0 · 125 = 0
Martin-Gay, Beginning Algebra, 5ed 5 Evaluating Exponents Odd exponent: Negative result Example : Evaluate ( - 3) 3 .

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mgb5e_ppt_1_7 - 1.7 Multiplying and Dividing Real Numbers...

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