Choose a word or term that best completes each statement. 1. If both compositions result in the,then the functions are inverse functions. identity function 2. In a(n), the results of one function are used to evaluate a second composition of functions 3. Radicals are if both the index and the radicand are identical. like radical expressions 4. When there is more than one real root, the nonnegative root is called the. principal root 7. Two relations are if and only if one relation contains the element (b, a) when the other relation contains the element (a, b). inverse relations 8. When solving a radical equation, sometimes you will obtain a number that does not satisfy the original equation. Such a number is called a(n). extraneous solution 9. The square root function is a type of. 10. radical function Find and. 5. To eliminate radicals from a denominator or fractions from a radicand, you use a process called. rationalizing the denominator 6. Equations with radicals that have variables in the radicands are called. radical equations esolutions Manual - Powered by Cognero Page 1
11. 14. 15. 12. 16. MEASUREMENT The formula converts 13. yards y to feet f and converts inches n to feet f. Write a composition of functions that converts yards to inches. Substitute 3y for f into the second equation and solve for n. esolutions Manual - Powered by Cognero Page 2
Find the inverse of each Then graph the function and its inverse. 18. 17. Rewrite f (x) as y = 5x 6. Interchange the variables and solve for y. Rewrite f (x) as y = 3x 5. Interchange the variables and solve for y. -1 Replace y with f (x). Graph the function and its inverse in the same coordinate plane. Replace y with f -1 (x). Graph the function and its inverse in the same coordinate plane. esolutions Manual - Powered by Cognero Page 3
19. 20. Rewrite f (x) as Interchange the Rewrite f (x) as Interchange the variables variables and solve for y. and solve for y. Replace y with f -1 (x). Graph the function and its inverse in the same coordinate plane. Replace y with f -1 (x). Graph the function and its inverse in the same coordinate plane. esolutions Manual - Powered by Cognero Page 4
21. 22. Rewrite f (x) as Interchange the variables and solve for y. Rewrite f (x) as Interchange the variables and solve for y. Replace y with f -1 (x). Graph the function and its inverse in the same coordinate plane. Replace y with f -1 (x). Graph the function and its inverse in the same coordinate plane. esolutions Manual - Powered by Cognero Page 5
23. SHOPPING Samuel bought a computer. The sales tax rate was 6% of the sale price, and he paid $50 for shipping. Find the sale price if Samuel paid a total of $1322. Let x be the sale price of the computer. 25. Graph the function. The equation that represent the situation is Solve for x. 24. The sale price is $1200. Use the horizontal line test to determine whether the inverse of each function is also a Graph the function. 26. No horizontal line can be drawn so that it passes through more than one point. The inverse of this function is a Graph the function. The horizontal line drawn passes through more than one point. So, the inverse of this function is not a The horizontal line drawn passes through more than one point. So, the inverse of this function is not a esolutions Manual - Powered by Cognero Page 6
27. 29. Graph the function. Graph of the function. The horizontal line drawn passes through more than one point. The inverse of this function is not a The horizontal line drawn passes through more than one point. So, the inverse of this function is not a 28. Graph the function. 30. FINANCIAL LITERACY During the last month, Jonathan has made two deposits of $45, made a deposit of double his original balance, and has withdrawn $35 five times. His balance is now $189. Write an equation that models this problem. How much money did Jonathan have in his account at the beginning of the month? Let x be the original balance in Jonathan s account. The equation that represents the situation is Solve for x. The horizontal line y = 3 drawn passes through more than one point. So, the inverse of this function is not a The original balance in the account is about $91.33. esolutions Manual - Powered by Cognero Page 7
Graph each State the domain and range. 32. 31. Identify the domain. Identify the domain. Write the radicand as greater than or equal to 0. Write the radicand as greater than or equal to 0. Make a table of values for and graph the Make a table of values for and graph the The domain is, and the range is The domain is, and the range is esolutions Manual - Powered by Cognero Page 8
33. 34. Identify the domain. Write the radicand as greater than or equal to 0. Identify the domain. Write the radicand as greater than or equal to 0. Make a table of values for and graph the Make a table of values for and graph the The domain is, and the range is The domain is, and the range is esolutions Manual - Powered by Cognero Page 9
35. 36. Identify the domain. Write the radicand as greater than or equal to 0. Identify the domain. Write the radicand as greater than or equal to 0. Make a table of values for and graph the Make a table of values for and graph the The domain is, and the range is The domain is, and the range is esolutions Manual - Powered by Cognero Page 10
37. GEOMETRY The area of a circle is given by the formula. What is the radius of a circle with an area of 300 square inches? 39. Substitute 300 for A in the formula and solve for r. The radius of the circle is about 9.8 in. 40. 38. Graph each inequality. Simplify. 41. esolutions Manual - Powered by Cognero Page 11
42. 47. 43. 48. 44. 49. PHYSICS The velocity v of an object can be defined as, where m is the mass of an object and K is the kinetic energy in joules. Find the velocity in meters per second of an object with a mass of 17 grams and a kinetic energy of 850 joules. 45. Substitute 17 for m and 850 for K in the formula and solve for v: The velocity of the object is 10 m/s. 46. esolutions Manual - Powered by Cognero Page 12
Simplify. 54. 50. 51. 55. 52. 56. 53. esolutions Manual - Powered by Cognero Page 13
57. Simplify each expression. 59. 58. GEOMETRY What are the perimeter and the area of the rectangle? 60. Substitute for length and for width in the perimeter formula and simplify. 61. The perimeter of the rectangle is units. The area of the rectangle is square units. esolutions Manual - Powered by Cognero Page 14
Simplify each expression. 65. GEOMETRY What is the area of the circle? 62. Substitute and simplify.] for r in the area of circle formula 63. So, the area of the circle is units 2. Solve each equation. 64. 66. esolutions Manual - Powered by Cognero Page 15
67. 71. 68. CHECK: 69. no solution 72. 70. esolutions Manual - Powered by Cognero Page 16
73. 75. Solve each inequality. Since the radicand of a square root must be greater than or equal to zero, first solve to identify the values of x for which the left side of the inequality is defined. 74. PHYSICS The formula represents the Now, solve. swing of a pendulum, where t is the time in seconds for the pendulum to swing back and forth and is the length of the pendulum in feet. Find the length of a pendulum that makes one swing in 2.75 seconds. Substitute 2.75 for t in the formula and solve. The solution region is. The length of a pendulum is about 6.13 ft. esolutions Manual - Powered by Cognero Page 17
76. 77. Since the radicand of a square root must be greater than or equal to zero, first solve to identify the values of x for which the left side of the inequality is defined. Since the radicand of a square root must be greater than or equal to zero, first solve to identify the values of x for which the left side of the inequality is defined. Now, solve. Now, solve. The solution region is The solution region is. esolutions Manual - Powered by Cognero Page 18
78. 79. Since the radicand of a square root must be greater than or equal to zero, first solve to identify the values of x for which the left side of the inequality is defined. Since the radicand of a square root must be greater than or equal to zero, first solve to identify the values of x for which the left side of the inequality is defined. Now, solve. Now, solve. The solution region is. Since there is no common region between the inequalities, the inequality has no solution. esolutions Manual - Powered by Cognero Page 19
80. Since the radicand of a square root must be greater than or equal to zero, first solve to identify the values of x for which the left side of the inequality is defined. Now, solve. The solution region is. 81. esolutions Manual - Powered by Cognero Page 20