# A.2. Exponents and Radicals. Integer Exponents. What you should learn. Exponential Notation. Why you should learn it. Properties of Exponents

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1 Appendix A. Exponents and Radicals A11 A. Exponents and Radicals What you should learn Use properties of exponents. Use scientific notation to represent real numbers. Use properties of radicals. Simplify and combine radicals. Rationalize denominators and numerators. Use properties of rational exponents. Why you should learn it Real numbers and algebraic expressions are often written with exponents and radicals. For instance, in Exercise 105 on page A, you will use an expression involving rational exponents to find the time required for a funnel to empty for different water heights. You can use a calculator to evaluate exponential expressions. When doing so, it is important to know when to use parentheses because the calculator follows the order of operations. For instance, evaluate 4 as follows Scientific: Graphing: Technology y x 4 4 ENTER > The display will be 16. If you omit the parentheses, the display will be 16. Integer Exponents Repeated multiplication can be written in exponential form. Repeated Multiplication Exponential Form a a a a a 444 xxxx Exponential Notation If a is a real number and n is a positive integer, then a n a a a... a n factors 4 x 4 where n is the exponent and a is the base. The expression a n is read a to the nth power. An exponent can also be negative. In Property below, be sure you see how to use a negative exponent. Properties of Exponents Let a and b be real numbers, variables, or algebraic expressions, and let m and n be integers. (All denominators and bases are nonzero.) Property Example 1. a m a n a mn a m a n amn a n 1 a n 1 a n a 0 1, a 0 x 10 1 ab m a m b m a m n a mn 7. a b m am b m x x 8 x 8. a a a 4 a 5 x 7 x 4 x7 4 x y 4 1 y 4 1 y 4 5x 5 x 15x y 4 y (4) y 1 1 y 1

2 A1 Appendix A Review of Fundamental Concepts of Algebra It is important to recognize the difference between expressions such as 4 and 4. In 4, the parentheses indicate that the exponent applies to the negative sign as well as to the, but in 4 4, the exponent applies only to the. So, 4 16 and The properties of exponents listed on the preceding page apply to all integers m and n, not just to positive integers as shown in the examples in this section. Example 1 Using Properties of Exponents Use the properties of exponents to simplify each expression. ab 4 4ab b. xy c. a4a 0 d. Solution ab 4 4ab 4aab 4 b 1a b b. xy x y 8x y 6 c. a4a 0 a1 a, a 0 d. 5x x 5 x 5x 6 y y Now try Exercise 5. 5x y Example Rewriting with Positive Exponents Rarely in algebra is there only one way to solve a problem. Don t be concerned if the steps you use to solve a problem are not exactly the same as the steps presented in this text. The important thing is to use steps that you understand and, of course, steps that are justified by the rules of algebr For instance, you might prefer the following steps for Example (d). x y y x y 9x 4 Note how Property is used in the first step of this solution. The fractional form of this property is a b m b a m. Rewrite each expression with positive exponents. 1 1a b. c. b x 1 4 d. x 4a b Solution x 1 1 x Property b. 1 x 1x x The exponent does not apply to. c. 1a b 4 a5 4a b 1a a 4b b 4 b 5 Properties and 1 d. x y x y Properties 5 and 7 x 4 y y x 4 y 9x 4 Now try Exercise. Property 6 Property x y

3 Scientific Notation Appendix A. Exponents and Radicals A1 Exponents provide an efficient way of writing and computing with very large (or very small) numbers. For instance, there are about 59 billion billion gallons of water on Earth that is, 59 followed by 18 zeros. 59,000,000,000,000,000,000 It is convenient to write such numbers in scientific notation. This notation has the form ± c 10 n, where 1 c < 10 and n is an integer. So, the number of gallons of water on Earth can be written in scientific notation as ,000,000,000,000,000, The positive exponent 0 indicates that the number is large (10 or more) and that the decimal point has been moved 0 places. A negative exponent indicates that the number is small (less than 1). For instance, the mass (in grams) of one electron is approximately decimal places Example Scientific Notation Write each number in scientific notation b. 86,100,000 Solution b. 86,100, Now try Exercise 7. Example 4 Decimal Notation Write each number in decimal notation b Solution b Now try Exercise 41. Technology Most calculators automatically switch to scientific notation when they are showing large (or small) numbers that exceed the display range. To enter numbers in scientific notation, your calculator should have an exponential entry key labeled EE or EXP. Consult the user s guide for your calculator for instructions on keystrokes and how numbers in scientific notation are displayed.

4 A14 Appendix A Review of Fundamental Concepts of Algebra Radicals and Their Properties A square root of a number is one of its two equal factors. For example, 5 is a square root of 5 because 5 is one of the two equal factors of 5. In a similar way, a cube root of a number is one of its three equal factors, as in Definition of nth Root of a Number Let a and b be real numbers and let n be a positive integer. If a b n then b is an nth root of If n, the root is a square root. If n, the root is a cube root. Some numbers have more than one nth root. For example, both 5 and 5 are square roots of 5. The principal square root of 5, written as 5, is the positive root, 5. The principal nth root of a number is defined as follows. Principal nth Root of a Number Let a be a real number that has at least one nth root. The principal nth root of a is the nth root that has the same sign as It is denoted by a radical symbol n Principal nth root The positive integer n is the index of the radical, and the number a is the radicand. If n, omit the index and write a rather than (The plural of index is indices.) A common misunderstanding is that the square root sign implies both negative and positive roots. This is not correct. The square root sign implies only a positive root. When a negative root is needed, you must use the negative sign with the square root sign. Incorrect: 4 ± Correct: 4 and 4 Example 5 Evaluating Expressions Involving Radicals 6 6 because 6 6. b. 6 6 because c. 15 because d. 5 because 5. e. 481 is not a real number because there is no real number that can be raised to the fourth power to produce 81. Now try Exercise 51.

5 Appendix A. Exponents and Radicals A15 Here are some generalizations about the nth roots of real numbers. Generalizations About nth Roots of Real Numbers Real Number a Integer n Root(s) of a Example a > 0 n > 0, is even. na, a n 481, 81 4 a > 0 or a < 0 n is odd. na 8 a < 0 n is even. No real roots 4 is not a real number. a 0 n is even or odd. n Integers such as 1, 4, 9, 16, 5, and 6 are called perfect squares because they have integer square roots. Similarly, integers such as 1, 8, 7, 64, and 15 are called perfect cubes because they have integer cube roots. Properties of Radicals Let a and b be real numbers, variables, or algebraic expressions such that the indicated roots are real numbers, and let m and n be positive integers. Property Example 1.. na m a n m na b n ab n na. b 0 nb a n b, 4. m a n mn a 5. a n n a 6. For n even, For n odd, na n na n a A common special case of Property 6 is a a. Example 6 Using Properties of Radicals Use the properties of radicals to simplify each expression. 8 b. 5 c. x d. 6y 6 Solution b. c. d x x 6y 6 y Now try Exercise 61.

6 A16 Appendix A Review of Fundamental Concepts of Algebra Simplifying Radicals An expression involving radicals is in simplest form when the following conditions are satisfied. 1. All possible factors have been removed from the radical.. All fractions have radical-free denominators (accomplished by a process called rationalizing the denominator).. The index of the radical is reduced. To simplify a radical, factor the radicand into factors whose exponents are multiples of the index. The roots of these factors are written outside the radical, and the leftover factors make up the new radicand. Example 7 Simplifying Even Roots When you simplify a radical, it is important that both expressions are defined for the same values of the variable. For instance, in Example 7, 75x and 5xx are both defined only for nonnegative values of x. Similarly, in Example 7(c), 45x 4 and 5 x are both defined for all real values of x. Perfect 4th power Perfect square Leftover factor Leftover factor b. 75x 5x x Find largest square factor. c x x 5xx 45x 4 5x 5 x Now try Exercise 6(a). Find root of perfect square. Example 8 Perfect cube Simplifying Odd Roots Leftover factor 4 8 Perfect Leftover cube factor b. 4a 4 8a a Find largest cube factor. a a aa Find root of perfect cube. c. 40x 6 8x 6 5 Find largest cube factor. x 5 x 5 Now try Exercise 6. Find root of perfect cube.

7 Appendix A. Exponents and Radicals A17 Radical expressions can be combined (added or subtracted) if they are like radicals that is, if they have the same index and radicand. For instance,,, 1 and are like radicals, but and are unlike radicals. To determine whether two radicals can be combined, you should first simplify each radical. Example 9 Combining Radicals Find square factors. Find square roots and multiply by coefficients. Combine like terms. b. 16x 54x 4 8 x 7 x x x xx xx Find cube factors. Find cube roots. Combine like terms. Now try Exercise 71. Rationalizing Denominators and Numerators To rationalize a denominator or numerator of the form a bm or a bm, multiply both numerator and denominator by a conjugate: a bm and a bm are conjugates of each other. If a 0, then the rationalizing factor for m is itself, m. For cube roots, choose a rationalizing factor that generates a perfect cube. Example 10 Rationalizing Single-Term Denominators Rationalize the denominator of each expression. 5 b. 5 Solution is rationalizing factor. Multiply. 5 6 b. 5 is rationalizing factor Multiply. Now try Exercise 79.

8 A18 Appendix A Review of Fundamental Concepts of Algebra Additional Examples b c Example 11 Rationalizing a Denominator with Two Terms Now try Exercise 81. Multiply numerator and denominator by conjugate of denominator. Use Distributive Property. Square terms of denominator. Sometimes it is necessary to rationalize the numerator of an expression. For instance, in Appendix A.4 you will use the technique shown in the next example to rationalize the numerator of an expression from calculus. Do not confuse the expression 5 7 with the expression 5 7. In general, x y does not equal x y. Similarly, x y does not equal x y. Example Rationalizing a Numerator Now try Exercise 85. Rational Exponents Multiply numerator and denominator by conjugate of numerator. Square terms of numerator. Definition of Rational Exponents If a is a real number and n is a positive integer such that the principal nth root of a exists, then a 1n is defined as a 1n a, n where 1n is the rational exponent of Moreover, if m is a positive integer that has no common factor with n, then a mn a 1n m n a m and a mn a m 1n n a m. The symbol indicates an example or exercise that highlights algebraic techniques specifically used in calculus.

9 Appendix A. Exponents and Radicals A19 Rational exponents can be tricky, and you must remember that the expression b mn is not defined unless nb is a real number. This restriction produces some unusual-looking results. For instance, the number 8 1 is defined because 8, but the number 8 6 is undefined because 68 is not a real number. Technology There are four methods of evaluating radicals on most graphing calculators. For square roots, you can use the square root key. For cube roots, you can use the cube root key.for other roots, you can first convert the radical to exponential form and then use the exponential key, or you can use the xth root key x.consult the user s guide for your calculator for specific keystrokes. > The numerator of a rational exponent denotes the power to which the base is raised, and the denominator denotes the index or the root to be taken. Power Index b mn n b m n b m When you are working with rational exponents, the properties of integer exponents still apply. For instance, 1 1 (1)(1) 56. Example 1 Changing from Radical to Exponential Form 1 b. xy 5 xy 5 xy (5) c. xx 4 xx 4 x 1(4) x 74 Now try Exercise 87. Example 14 Changing from Exponential to Radical Form b. x y x y x y y 4 z 14 y z 14 y 4 z c. a 1 a 1 a d. x 0. x 15 x 5 Now try Exercise 89. Rational exponents are useful for evaluating roots of numbers on a calculator, for reducing the index of a radical, and for simplifying expressions in calculus. Example 15 Simplifying with Rational Exponents b x 5 x 4 15x (5)(4) 15x 111, x 0 c. 9a a 9 a 1 a Reduce index. d e. x 1 4 x 1 1 x 1 (4)(1) f. x 1, x 1 x 1 x 1 x 11 1 x 1 1 x 1 1 x 1 x 1 0 x 1, x 1 Now try Exercise 99. x 1

10 A0 Appendix A Review of Fundamental Concepts of Algebra A. Exercises VOCABULARY CHECK: Fill in the blanks. 1. In the exponential form a n, n is the and a is the.. A convenient way of writing very large or very small numbers is called.. One of the two equal factors of a number is called a of the number. 4. The of a number is the nth root that has the same sign as a, and is denoted by n 5. In the radical form, na the positive integer n is called the of the radical and the number a is called the. 6. When an expression involving radicals has all possible factors removed, radical-free denominators, and a reduced index, it is in. 7. The expressions a bm and a bm are of each other. 8. The process used to create a radical-free denominator is know as the denominator. 9. In the expression b mn, m denotes the to which the base is raised and n denotes the or root to be taken. In Exercises 1 and, write the expression as a repeated multiplication problem In Exercises and 4, write the expression using exponential notation In Exercises 5 1, evaluate each expression. 5. (a) 6. (a) (a) 0 8. (a) (a) (a) (a) (a) 1 In Exercises 1 16, use a calculator to evaluate the expression. (If necessary, round your answer to three decimal places.) In Exercises 17 4, evaluate the expression for the given value of x. x Expression Value 17. x 18. 7x 19. 6x x x 4 x 10 x 1. x x. x 4. 4x 4. 5x In Exercises 5 0, simplify each expression. 5. (a) 5z 5x 4 x 6. (a) x 4x 0 7. (a) 6y y 0 x 5 8. (a) z z 4 7x 9. (a) x r 4 r 6 0. (a) x 1 x x 1 5y 8 10y 4 1x y 9x y 4 y y 4 In Exercises 1 6, rewrite each expression with positive exponents and simplify. 1. (a) x 5 0, x 5 x. (a) x 5 0, x 0 z z 1 x

11 Appendix A. Exponents and Radicals A1. (a) x 4x 1 4. (a) 4y 8y 4 5. (a) x x n 6. (a) x x n In Exercises 7 40, write the number in scientific notation. 7. Land area of Earth: 57,00,000 square miles 8. Light year: 9,460,000,000,000 kilometers 9. Relative density of hydrogen: gram per cubic centimeter 40. One micron (millionth of a meter): inch In Exercises 41 44, write the number in decimal notation. 41. Worldwide daily consumption of Coca-Cola: ounces (Source: The Coca-Cola Company) 4. Interior temperature of the sun: degrees Celsius 4. Charge of an electron: coulomb 44. Width of a human hair: meter In Exercises 45 and 46, evaluate each expression without using a calculator. 45. (a) (a) x 10 1 In Exercises 47 50, use a calculator to evaluate each expression. (Round your answer to three decimal places.) 47. (a) ,000,000 9,000, (a) (a) (a) In Exercises 51 56, evaluate each expression without using a calculator (a) 9 5. (a) (a) 5 a b a b a b b a n n xy (a) 55. (a) (a) In Exercises 57 60, use a calculator to approximate the number. (Round your answer to three decimal places.) 57. (a) (a) (a) (a) In Exercises 61 and 6, use the properties of radicals to simplify each expression (a) 6. (a) 1 54xy 4 In Exercises 6 74, simplify each radical expression. 6. (a) (a) (a) a4 b 65. (a) 7x 18 z 67. (a) 16x 5 75x y (a) x 4 4 y 5160x 8 z (a) (a) (a) 5x x 9y 10y 7. (a) 849x 14100x 48x 775x 7. (a) x 1 10x 1 780x 15x 74. (a) x 7 5x x 945x In Exercises 75 78, complete the statement with <, =, or > In Exercises 79 8, rationalize the denominator of the expression. Then simplify your answer x 5 4x

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