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".