The prices of food, gasoline, and other products have increased throughout the
world. In particular, escalating oil prices in recent years have caused increases in
transportation and shipping costs, which trickled down to affect prices of a variety
of goods and services.
Although prices tend to go up over time, the rate at which they increase (the
inflation rate) varies considerably. The Consumer Price Index (CPI) used by the
U.S. government measures changes in prices for goods purchased by typical
American families over time. In Example 6of Section 9.4,we use a quadratic
functionto model the CPI.
Quadratic Equations,
Inequalities, and Functions
9.1 The Square Root Property and Completing the Square
Property and
Completing the
Square
9.2 The Quadratic Formula
Formula
9.3 Equations Quadratic in Form
in Form
Summary Exercises on
Solving Quadratic Equations
9.4 Formulas and Further Applications
Further Applications
9.5 Graphs of Quadratic Functions
Functions
9.6 More About
Parabolas and Their
Applications
9.7 Polynomial and Rational Inequalities
Rational Inequalities
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CHAPTER