By Lial M.L., Hornsby J.

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53. 56. 59. 62. 65. 12 ϩ 3 и 4 9и4Ϫ8Ϭ2 Ϫ3͑5͒2 Ϫ ͑Ϫ2͒͑Ϫ8͒ Ϫ4 Ϫ 3 и 5 ϩ 62 6͉4 Ϫ 5͉ Ϫ 24 Ϭ 3 68. ͑Ϫ6 Ϫ 3͉͒Ϫ2 Ϫ 3͉ Ϭ 9 ͩ ͪ 71. Ϫ14 Ϫ 73. 75. Ϭ ͑2 и 6 Ϫ 10͒ ͑ Ϫ5 ϩ ͙4 ͒͑Ϫ22͒ Ϫ5 Ϫ 1 2͑Ϫ5͒ ϩ ͑Ϫ3͒͑Ϫ2͒ Ϫ8 ϩ 32 Ϫ 1 ͩ ͪ Ϫ5 Ϫ 9 Ϫ6 Ϫ7 Ϫ9 Ϫ 11 ϩ 3 и 7 5Ϫ3 77. 2 7 15 ϩ 5 и 2 10 ϩ 30 Ϭ 2 и 3 Ϫ9͑2͒2 Ϫ ͑Ϫ3͒͑Ϫ2͒ Ϫ7͑ ͙36 ͒ Ϫ ͑Ϫ2͒͑Ϫ3͒ Ϫ4͉2 Ϫ 4͉ ϩ 8 и 2 2 5 69. 6 ϩ ͑Ϫ9͒ Ϫ и 16 3 8 6 и 3 Ϫ 12 Ϭ 4 12 ϩ 24 Ϭ 3 и 2 5 Ϫ 7 и 3 Ϫ ͑Ϫ2͒3 Ϫ8͑ ͙64 ͒ Ϫ ͑Ϫ3͒͑Ϫ7͒ ͉Ϫ6 Ϫ 5͉͑Ϫ8͒ ϩ 32 5 3 70. 7 Ϫ ͑Ϫ8͒ ϩ 12 и 4 6 54. 57. 60. 63. 66. 55.

4 Solve linear equations with fractions or decimals. 5 Identify conditional equations, contradictions, and identities. In the previous chapter we began to use algebraic expressions. Some examples of algebraic expressions are x 3y 8 and 8x ϩ 9, y Ϫ 4, . Algebraic expressions z Equations and inequalities compare algebraic expressions, just as a balance scale compares the weights of two quantities. Many applications of mathematics lead to equations, statements that two algebraic expressions are equal.

Now Try Exercises 53 and 57. An Addison-Wesley product. Copyright © 2004 Pearson Education, Inc. 28 CHAPTER 1 Review of the Real Number System EXAMPLE 6 Using the Order of Operations Simplify. (a) 10 Ϭ 5 ϩ 2͉ 3 Ϫ 4 ͉ Evaluate the absolute value first. 10 Ϭ 5 ϩ 2͉ 3 Ϫ 4 ͉ 10 Ϭ 5 ϩ 2͉ Ϫ1 ͉ Subtract inside the absolute value bars. 10 Ϭ 5 ϩ 2 и 1 2ϩ2 4 Take the absolute value. Divide and multiply. Add. (b) 4 и 32 ϩ 7 Ϫ ͑2 ϩ 8͒ Work inside the parentheses first. 4 и 32 ϩ 7 Ϫ ͑2 ϩ 8͒ 4 и 32 ϩ 7 Ϫ 10 4 и 9 ϩ 7 Ϫ 10 36 ϩ 7 Ϫ 10 43 Ϫ 10 33 (c) Add inside parentheses.

### Algebra for College Students by Lial M.L., Hornsby J.

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