Algebra and Trigonometry
Key differences between 4th and 3rd editions
 Time lapse between current and previous publications: 4 years (2015 vs 2011).
 For the first time Stewart's Algebra and Trigonometry was published in 2000.
 Fourth Edition includes more than 20% of new exercises. Skills Plus exercises represent more challenging problems.
 Chapter P includes two completely new sections:
 P8. Solving Basic Equations
 P9. Modeling with Equations
 Chapter 1 incorporates material from two former chapters 1 "Equations and Inequalities" and 2 "Coordinates and Graphs".
 Chapter 2 has new section 2.5 explaining linear functions; rate of change of linear function and slope; making and using linear models.
 Chapter 3 has new section 3.7 explaining how to solve polynomial inequalities and rational inequalities.
 Chapter 4 covers application of logarithmic and exponential functions in two separate sections.
 Chapter 6 has new subsection "Phase and Phase Difference"
 Former Chapter 11 has been splitted into two chapters 10 "Systems of Equations and Inequalities" and 11 "Matrices and Determinants".
 Three New Appendixes:
 Graphing with a Graphing Calculator
 Using the TI83/84 Graphing Calculator
 Review of Geometry
4th Edition of
Algebra and Trigonometry
eBook, 1040 pages
eBook ISBN: 9781305537033
Published by: Cengage Learning, January 13, 2015
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 $40.38 
Hardcover, 1040 pages
ISBN10: 1305071743
ISBN13: 9781305071742
Published by: Cengage Learning, January 16, 2015
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3rd Edition of
Algebra and Trigonometry
eBook, 1040 pages
eBook ISBN: 9781133386018
Published by: Wadsworth Publishing, February 01, 2013
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 $28.31 
Hardcover, 1040 pages
ISBN10: 0840068131
ISBN13: 9780840068132
Published by: Cengage Learning, February 18, 2011
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2nd Edition of
Algebra and Trigonometry
with Video Skillbuilder CDROM
Hardcover, 1088 pages
ISBN10: 0495013579
ISBN13: 9780495013570
Published by: Cengage Learning, January 03, 2006
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Hardcover, 1088 pages
ISBN10: 0495016764
ISBN13: 9780495016762
Published by: Cengage Learning, January 03, 2006
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Enhanced Edition
Hardcover, 1120 pages
ISBN10: 1439047308
ISBN13: 9781439047309
Published by: Cengage Learning, July 17, 2009
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Saving advice
Hardcover
 Used 4th edition can save you $31.1 over the new one.

Used previous 3rd edition costs $74.6 less than the used 4th.