Wireless communication uses radio waves to carry signals and messages across
distances. Cellular phones, one of the most popular forms of wireless communication,
have become an invaluable tool for people to stay connected to family, friends, and
work while on the go. In 2007, there were about 243 million cell phone subscribers
in the United States, with 81% of the population having cell phone service. Total
revenue from this service was about $133 billion. (Source:CITA—The Wireless
Association.)
In Exercise 37of Section 6.6,we use a quadratic equationto model the
number of cell phone subscribers in the United States.
Factoring and Applications
6.1 The Greatest
Common Factor;
Factoring by
Grouping
6.2 Factoring Trinomials
6.3 More on Factoring Trinomials
6.4 Special Factoring Techniques
Techniques
Summary Exercises
on Factoring
6.5 Solving Quadratic Equations by Factoring
Equations by
Factoring
6.6 Applications of Quadratic Equations
Quadratic Equations
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CHAPTER