Beginning Algebra (Available 2010 Titles Enhanced Web by Jerome E. Kaufmann, Karen L. Schwitters

By Jerome E. Kaufmann, Karen L. Schwitters

Starting ALGEBRA employs a confirmed, three-step problem-solving approach--learn a ability, use the ability to unravel equations, after which use the equations to resolve software problems--to maintain scholars inquisitive about development talents and reinforcing them via perform. this easy and simple strategy, in an easy-to-read structure, has helped many scholars clutch and observe basic problem-solving talents. The conscientiously based pedagogy contains studying pursuits, distinct examples to increase techniques, perform routines, an intensive collection of problem-set workouts, and well-organized end-of-chapter studies and checks. also, the fresh and uncluttered layout is helping preserve scholars concerned with the options whereas minimizing distractions. difficulties and examples reference a vast array of subject matters, in addition to profession components resembling electronics, mechanics, and future health, exhibiting scholars that arithmetic is a part of daily life. additionally, as advised by way of the yankee Mathematical organization of Two-Year faculties, many simple geometric innovations are built-in within the book's problem-solving units. The text's source package--anchored through superior WebAssign, an internet homework administration tool--saves teachers time whereas additionally delivering extra support and skill-building perform for college kids open air of sophistication.

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75. 5x Ϫ 9xy ϩ 3x ϩ 2xy for x ϭ 12 and y ϭ Ϫ1 76. Ϫ9x ϩ xy Ϫ 4xy Ϫ x for x ϭ 10 and y ϭ Ϫ11 77. (a Ϫ b) Ϫ (a ϩ b) for a ϭ 19 and b ϭ Ϫ17 78. (a ϩ b) Ϫ (a Ϫ b) for a ϭ Ϫ16 and b ϭ 14 79. Ϫ3x ϩ 7x ϩ 4x Ϫ 2x Ϫ x for x ϭ Ϫ15 82. 15a(x ϩ y) 83. (Ϫ6a ϩ 7b) ϩ 11c and 84. 2x Ϫ 3y ϩ 4z and 2x Ϫ 4z ϩ 3y 85. a ϩ 5(x ϩ y) and (a ϩ 5)x ϩ y 86. 7x ϩ 6( y Ϫ 2z) for x ϭ Ϫ13 5a(3x ϩ 3y) and 87. 9m ϩ 8(3p Ϫ q) and and 7b ϩ (11c Ϫ 6a) 6(2z Ϫ y)ϩ 7x 8(3p Ϫ q) ϩ 9m THOUGHTS INTO WORDS 88. State in your own words the associative property for addition of integers.

7 3 ■ Note that in Example 9 we chose 6 as our common denominator, and 6 is the least common multiple of the original denominators 2 and 3. ) In general, we use the least common multiple of the denominators of the fractions to be added or subtracted as a least common denominator (LCD). 4 that the least common multiple is found either by inspection or by using the prime factorization forms of the numbers. Let’s consider some examples involving these procedures. EXAMPLE 10 Add 2 1 ϩ . 4 5 Solution By inspection we see that the LCD is 20.

53. 12 and 16 54. 30 and 36 55. 56 and 64 56. 72 and 96 For Problems 31– 42, factor each composite number into a product of prime numbers. For example, 18 ϭ 2 и 3 и 3. 57. 63 and 81 58. 60 and 72 59. 84 and 96 60. 48 and 52 31. 26 32. 16 33. 36 61. 36, 72, and 90 62. 27, 54, and 63 34. 80 35. 49 36. 92 63. 48, 60, and 84 64. 32, 80, and 96 37. 56 38. 144 39. 120 40. 84 41. 135 42. 98 3 Factor a Whole Number into a Product of Prime Numbers 5 Find the Least Common Multiple For Problems 65 –76, find the least common multiple of the given numbers.

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