By Margaret L. Lial
Is there something extra appealing than an “A” in Algebra? to not the Lial staff! Marge Lial, John Hornsby, and Terry McGinnis write their textbooks and accompanying assets with one objective in brain: giving scholars the entire instruments they should be successful. With this revision, the Lial staff has additional subtle the presentation and workouts during the textual content. they give numerous fascinating new assets for college students that might offer additional support while wanted, whatever the studying atmosphere (classroom, lab, hybrid, on-line, etc)–new examine abilities actions within the textual content, an elevated video software on hand in MyMathLab and at the Video assets on DVD, and extra!
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Additional resources for Algebra for College Students, 7th Edition
015 (g) - 6 = - 61 2 1- 62 = - 4 3 NOW TRY OBJECTIVE 5 Find reciprocals and divide real numbers. The definition of division depends on the idea of a multiplicative inverse, or reciprocal. Two numbers are reciprocals if they have a product of 1. Reciprocal The reciprocal of a nonzero number a is 1a . The table gives several numbers and their reciprocals. 05 20 0 None - 25 A - 52 B = 1 - 6 A - 16 B = 1 A B =1 7 11 11 7 Reciprocals have a product of 1. 051202 = 1 There is no reciprocal for 0 because there is no number that can be multiplied by 0 to give a product of 1.
E) ͙100 = 10, since 10 2 = 100. (f ) - ͙100 = - 10, since the negative sign is outside the radical symbol. (g) ͙ - 100 is not a real number, because the negative sign is inside the radical symbol. No real number squared equals - 100. Notice the difference among the square roots in parts (e), (f ), and (g). Part (e) is the positive or principal square root of 100, part (f ) is the negative square root of 100, and part (g) is the square root of - 100, which is not a real number. NOW TRY CAUTION The symbol ͙ is used only for the positive square root, except that ͙0 = 0.
5 0 82. 13 0 10 12 83. , a- b 17 5 87. 2 22 33 84. , a- b 23 5 88. 2 12 13 85. 4 3 89. 01 7 6 86. 1 30 90. 06 22 CHAPTER 1 Review of the Real Number System Exercises 91–116 provide more practice on operations with fractions and decimals. Perform the indicated operations. 91. 1 7 - a- b 6 9 92. 7 1 - a- b 10 6 93. - 1 7 + 9 12 11 4 15 9 94. - 1 13 + 12 16 95. - 3 5 8 12 96. - 97. - 7 2 3 + 30 45 10 98. - 8 3 7 + 15 20 6 99. 5 9 4 a- b a- b 6 10 5 102. 100. 9 7 a- b 20 15 7 9 , a- b 103. 6 10 101.
Algebra for College Students, 7th Edition by Margaret L. Lial