By James Stewart, Lothar Redlin, Saleem Watson

ISBN-10: 0840068131

ISBN-13: 9780840068132

This most sensible promoting writer workforce explains ideas easily and obviously, with no glossing over tricky issues. challenge fixing and mathematical modeling are brought early and bolstered all through, supplying scholars with an excellent beginning within the ideas of mathematical considering. entire and calmly paced, the booklet presents whole assurance of the functionality notion, and integrates an important quantity of graphing calculator fabric to assist scholars boost perception into mathematical principles. The authors' recognition to aspect and readability, almost like present in James Stewart's market-leading Calculus booklet, is what makes this e-book the industry chief.

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**Extra resources for Algebra and Trigonometry (3rd Edition)**

**Sample text**

With this definition it can be proved that the Laws of Exponents also hold for rational exponents. EXAMPLE 3 1/2 (a) 4 Using the Definition of Rational Exponents ϭ 14 ϭ 2 3 (b) 82/3 ϭ 1 182 2 ϭ 22 ϭ 4 Alternative solution: 3 2 3 82/3 ϭ 2 8 ϭ 2 64 ϭ 4 24 CHAPTER P | Prerequisites 1 (c) 125Ϫ1/3 ϭ 1 ϭ 3 1125 125 1 ϭ 4/3 ϭ x Ϫ4/3 (d) 3 x 2x 4 1/3 ϭ 1 5 1 ■ NOW TRY EXERCISES 17 AND 19 Using the Laws of Exponents with Rational Exponents EXAMPLE 4 (a) a 1/3a 7/3 ϭ a 8/3 (b) a 2/5a 7/5 a 3/5 Law 1: aman ϭ amϩn ϭ a 2/5ϩ7/5Ϫ3/5 ϭ a 6/5 Law 1, Law 2: (c) 12a 3b 4 2 3/2 ϭ 23/2 1a 3 2 3/2 1b 4 2 3/2 am ϭ a mϪn an Law 4: 1abc 2 n ϭ a nb ncn ϭ 1 122 3a 313/22b 413/22 Law 3: 1a m 2 n ϭ a mn ϭ 212a 9/2b 6 (d) a 2x 3/4 y 1/3 b a y4 3 x b ϭ Ϫ1/2 ϭ 23 1x 3/4 2 3 1y 1/3 2 3 # 1y 4x 1/2 2 8x 9/4 # 4 1/2 y x y Laws 5, 4, and 7 Law 3 ϭ 8x 11/4y 3 Laws 1 and 2 ■ NOW TRY EXERCISES 53, 61, AND 65 Simplifying by Writing Radicals as Rational Exponents EXAMPLE 5 3 (a) 121x2 131 x2 ϭ 12x 1/2 2 13x 1/3 2 ϭ 6x 1/2ϩ1/3 (b) 3x2x ϭ 1xx 1/2 2 1/2 ϭ 1x ϭ 6x Definition of rational exponents 5/6 Definition of rational exponents 2 3/2 1/2 ϭ x 3/4 Law 1 Law 1 Law 3 ■ NOW TRY EXERCISES 71 AND 81 ▼ Rationalizing the Denominator It is often useful to eliminate the radical in a denominator by multiplying both numerator and denominator by an appropriate expression.

A2 . . 1a # a # . . # a2 1444442444443 1444442444443 1444442444443 m factors m factors m factors 144444444444424444444444443 n groups of factors ϭ a # a # . . # a ϭ amn 1442443 mn factors The cases for which m Յ 0 or n Յ 0 can be proved using the definition of negative exponents. ■ If n is a positive integer, we have PROOF OF LAW 4 1ab2 ϭ 1ab2 1ab2 p 1ab2 ϭ 1a # a # p # a2 # 1b # b # p # b2 ϭ anbn n 144424443 n factors 1442443 1442443 n factors n factors Here we have used the Commutative and Associative Properties repeatedly.

1a # a # . . # a2 1444442444443 1444442444443 1444442444443 m factors m factors m factors 144444444444424444444444443 n groups of factors ϭ a # a # . . # a ϭ amn 1442443 mn factors The cases for which m Յ 0 or n Յ 0 can be proved using the definition of negative exponents. ■ If n is a positive integer, we have PROOF OF LAW 4 1ab2 ϭ 1ab2 1ab2 p 1ab2 ϭ 1a # a # p # a2 # 1b # b # p # b2 ϭ anbn n 144424443 n factors 1442443 1442443 n factors n factors Here we have used the Commutative and Associative Properties repeatedly.

### Algebra and Trigonometry (3rd Edition) by James Stewart, Lothar Redlin, Saleem Watson

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