Precalculus: Mathematics for Calculus
Key differences between 7th and 6th editions
 Period between current and previous publications: 4 years (2015 vs 2011).
 Chapter 1:
 Contains section 1.6 "Complex Numbers" which was section 3.5 in the Sixth Edition.
 New section 1.12 "Modeling Variation" covers direct and inverse variations, combining different types of variation.
 Chapter 2:
 New section 2.5 "Linear Functions and Models" covers linear functions; slope and rate of change; making linear models from a rate of change, from a slope, involving speed.
 Chapter 3:
 New section 3.7 "Polynomial and Rational Inequalities" provides guidelines on solving polynomial and rational inequalities.
 Chapter 4:
 Two separate sections on the applications of functions  4.6 "Modeling with Exponential Functions" and 4.7 "Logarithmic Scales".
7th Edition of
Precalculus: Mathematics for Calculus
eBook, 1024 pages
eBook ISBN: 9781305537163
Published by: Cengage Learning, January 01, 2015
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ISBN10: 1305071751
ISBN13: 9781305071759
Published by: Cengage Learning, January 01, 2015
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6th Edition of
Precalculus: Mathematics for Calculus
eBook, 1008 pages
eBook ISBN: 9781133715047
Published by: Wadsworth Publishing, February 01, 2013
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Hardcover, 1008 pages
ISBN10: 0840068077
ISBN13: 9780840068071
Published by: Cengage Learning, January 01, 2011
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Hardcover, 1088 pages
ISBN10: 1111428743
ISBN13: 9781111428747
Published by: Brooks Cole, January 01, 2011
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Enhanced WebAssign Homework with eBook Access Card for One Term Math and Science
Hardcover
ISBN10: 1111495882
ISBN13: 9781111495886
Published by: Cengage Learning, January 01, 2011
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5th Edition of
Precalculus: Mathematics for Calculus
Enhanced Review Edition
Hardcover, 1072 pages
ISBN10: 0495392774
ISBN13: 9780495392774
Published by: Cengage Learning, February 05, 2007
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Hardcover, 933 pages
ISBN10: 0534492770
ISBN13: 9780534492779
Published by: Cengage Learning, October 20, 2005
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Enhanced Review Edition
Hardcover, 1072 pages
ISBN10: 0495392766
ISBN13: 9780495392767
Published by: Cengage Learning, February 05, 2007
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Paperback, 1056 pages
ISBN10: 0495109975
ISBN13: 9780495109976
Published by: Cengage Learning, October 27, 2005
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International Edition
Paperback, 960 pages
ISBN10: 0495125229
ISBN13: 9780495125228
Published by: Brooks Cole, December 2005
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Hardcover
 Used 7th edition can save you $119.96 over the new one.

Used previous 6th edition costs $56.54 less than the used 7th.