CHAPTER Quadratic Equations 10 10.1 The Square Root Property and 10.2 The Quadratic Formula Putting It All Together 10.3 Equations in Quadratic Form 10.4 Formulas and Applications 10.5 Quadratic Functions and Their Graphs 10.6 Applications of Quadratic Functions 10.7 Quadratic and Rational Inequalities Group Activity emPOWERme: Determine Your Saving Style 607 and Functions OUTLINE Study Strategies: Developing Financial Literacy Completing the Square and Graphing Other Parabolas Math at Work: Economist Anyone who has tried to keep track of their personal fi nances—managing checking accounts, credit cards, car loans, rent, utilities, and often more—knows how complicated money matters can be even for just one person. Jeremy Norton’s career accomplishments, then, seem even more impressive. As an economist writing for newspapers, magazines, and blogs, Jeremy needs to understand how fi nancial forces across the country, and even around the world, interact and affect each other. “Economics connects what happens at the local grocery store to what is happening at oil fi elds on the other side of the globe,” Jeremy explains. “Without mathematical models and sophisticated equations tracking economic forces, we wouldn’t be able to understand or predict how prices are going to rise and fall, whether companies will start to hire, and so on.” Jeremy says that while some elements of his job are very complicated, the fundamentals of economics are the same ones individuals use to manage their personal bottom lines. “The truth is,” Jeremy says, “that the most valuable economic lessons I learned were the ones I picked up outside the classroom, working to keep my expenses under control so I could pay my tuition.” We will introduce quadratic equations and functions in this chapter and also introduce strategies you can use to keep your personal fi nances in order.
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