By Margaret L. Lial, John Hornsby, Terry McGinnis
The Lial sequence has helped millions of scholars achieve developmental arithmetic via its pleasant writing type, quite a few life like examples, huge challenge units, and entire vitamins package deal. based on its confirmed tune list, this revision contains a new open layout, extra routines and purposes, and extra gains to aid either scholars and teachers be successful.
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Additional info for Algebra for College Students
Copyright © 2004 Pearson Education, Inc. 34 CHAPTER 1 Review of the Real Number System OBJECTIVE 2 Use the inverse properties. 1 we saw that the additive inverse of a number a is Ϫa and that the sum of a number and its additive inverse is 0. For example, 3 and Ϫ3 are additive inverses, as are Ϫ8 and 8. The number 0 is its own additive inverse. 2, we saw that two numbers with a product of 1 are reciprocals. As mentioned there, another name for reciprocal is multiplicative inverse. This is similar to the idea of an additive inverse.
64 39. ͙169 41. Ϫ͙400 42. Ϫ͙900 43. 45. 49 46. 64 47. ͙Ϫ36 40. ͙225 ͱ 100 121 44. ͱ 225 169 48. ͙Ϫ121 49. Match each square root with the appropriate value or description. (a) ͙144 (b) ͙Ϫ144 (c) Ϫ͙144 A. Ϫ12 B. 12 C. Not a real number 50. Explain why ͙Ϫ900 is not a real number. 51. If a is a positive number, is Ϫ͙Ϫa positive, negative, or not a real number? 52. If a is a positive number, is Ϫ͙a positive, negative, or not a real number? Simplify each expression. Use the order of operations. See Examples 5–7.
3 z Ϫ5 11 37. 6 x Ϫ1 5 38. Ϫ 7 r6 8 39. m m ϩ 5 2 3 40. x x Ϫ 1 5 4 41. x Ϫ 10 2 x ϩ Ϫ 5 5 3 42. 2r Ϫ 3 3 r ϩ Ϫ 7 7 3 43. 4t ϩ 1 t ϩ 5 t Ϫ 3 ϩ 3 6 6 44. 2x ϩ 5 3x ϩ 1 Ϫx ϩ 7 ϩ 5 2 2 An Addison-Wesley product. Copyright © 2004 Pearson Education, Inc. 2 Formulas 57 45. 12͑x ϩ 5000͒ 940 46. 13͑k ϩ 300͒ 61 47. 04͑50 ϩ r͒ 48. 18͑14,000 ϩ t͒ 49. 45x 50. 48x 51. A student tried to solve the equation 8x 7x by dividing each side by x, obtaining 8 7. He gave the solution set as ͞0. Why is this incorrect?
Algebra for College Students by Margaret L. Lial, John Hornsby, Terry McGinnis