U Can: Algebra I For Dummies
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Оглавление
Sterling Mary Jane. U Can: Algebra I For Dummies
Introduction
Part I
Chapter 1. Assembling Your Tools
Chapter 2. Deciphering Signs in Expressions
Chapter 3. Incorporating Algebraic Properties
Chapter 4. Making Fractions and Decimals Behave
Chapter 5. Exploring Exponents
Chapter 6. Taming Rampaging Radicals
Chapter 7. Simplifying Algebraic Expressions
Part II
Chapter 8. Working with Numbers in Their Prime
Chapter 9. Specializing in Multiplication Matters
Chapter 10. Dividing the Long Way to Simplify Algebraic Expressions
Chapter 11. Figuring on Factoring
Chapter 12. Taking the Bite out of Binomial Factoring
Chapter 13. Factoring Trinomials and Special Polynomials
Part III
Chapter 14. Establishing Ground Rules for Solving Equations
Chapter 15. Lining Up Linear Equations
Chapter 16. Muscling Up to Quadratic Equations
Chapter 17. Yielding to Higher Powers
Chapter 18. Reeling in Radical and Absolute Value Equations
Chapter 19. Getting Even with Inequalities
Part IV
Chapter 20. Facing Up to Formulas
Chapter 21. Making Formulas Work in Basic Story Problems
Chapter 22. Relating Values in Story Problems
Chapter 23. Measuring Up with Quality and Quantity Story Problems
Chapter 24. Getting a Handle on Graphing
Chapter 25. Extending the Graphing Horizon
Part V
Chapter 26. Ten Common Errors That Get Noticed
Chapter 27. Ten Quick Tips to Make Algebra a Breeze
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Отрывок из книги
One of the most commonly asked questions in an algebra classroom is, “What will I ever use this for?” Some teachers can give a good, convincing answer. Others hem and haw and stare at the floor. My favorite answer is, “Algebra gives you power.” Algebra gives you the power to move on to bigger and better things in mathematics. Algebra gives you the power of knowing that you know something that your neighbor doesn’t know. Algebra gives you the power to be able to help someone else with an algebra task or to explain to your child these logical mathematical processes.
Algebra is a system of symbols and rules that is universally understood, no matter what the spoken language. Algebra provides a clear, methodical process that can be followed from beginning to end. It’s an organizational tool that is most useful when followed with the appropriate rules. What power! Some people like algebra because it can be a form of puzzle solving. You solve a puzzle by finding the value of a variable. You may prefer Sudoku or Ken Ken or crosswords, but it wouldn’t hurt to give algebra a chance, too.
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Q. Write the expression using the correct symbols: The absolute value of the difference between x and 6 is multiplied by 7.
A. The difference between two values is the result of subtraction, so write x – 6. The absolute value of that difference is written . To multiply the absolute value by 7, just place the 7 in front of the absolute value bar – multiplication is assumed when no other operation is shown. So you have . The 7 can also be written behind the absolute value; it’s just that writing it in front is preferred.
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