10-2 Simplifying Radical Expressions. Simplify each expression. 1. SOLUTION: 2. SOLUTION: 3. SOLUTION: 4. SOLUTION: 5. SOLUTION:
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1 - Simplifying Radical Expressions Simplify each expression Page
2 - Simplifying Radical Expressions Page
3 - Simplifying Radical Expressions 9.. MULTIPLE CHOICE Which expression is equivalent to? A B C D The correct choice is D. Simplify each expression.. esolutions Manual - Powered by Cognero Page
4 - Simplifying Radical Expressions The correct choice is D. Simplify each expression.... Page 4
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6 - Simplifying Radical Expressions Simplify each expression Page 6
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11 - Simplifying Radical Expressions ROLLER COASTER Starting from a stationary position, the velocity v of a roller coaster in feet per second at the bottom of a hill can be approximated by, where h is the height of the hill in feet. a. Simplify the equation. b. Determine the velocity of a roller coaster at the bottom of a 4-foot hill. a. b. To determine the velocity of the roller coaster at the bottom of the hill, substitute 4 for h in the equation. The roller coaster will have a velocity of about 9.6 ft/sec at the bottom of a 4-foot hill. 6. CCSS PRECISION When fighting a fire, the velocity v of water being pumped into the air is modeled by the function, where h represents the maximum height of the water and g represents the acceleration due to gravity ( ft/s ). a. Solve the function for h. b. The Hollowville Fire Department needs a pump that will propel water 8 feet into the air. Will a pump advertised to project water with a velocity of 7 feet per second meet their needs? Explain. c. The Jackson Fire Department must purchase a pump that will propel water 9 feet into the air. Will a pump that is advertised to project water with a velocity of 77 feet per second meet the fire department s need? Explain. a. Page
12 - Simplifying Radical Expressions The roller coaster will have a velocity of about 9.6 ft/sec at the bottom of a 4-foot hill. 6. CCSS PRECISION When fighting a fire, the velocity v of water being pumped into the air is modeled by the function, where h represents the maximum height of the water and g represents the acceleration due to gravity ( ft/s ). a. Solve the function for h. b. The Hollowville Fire Department needs a pump that will propel water 8 feet into the air. Will a pump advertised to project water with a velocity of 7 feet per second meet their needs? Explain. c. The Jackson Fire Department must purchase a pump that will propel water 9 feet into the air. Will a pump that is advertised to project water with a velocity of 77 feet per second meet the fire department s need? Explain. a. b. To determine the height of the water, substitute 7 for v in the function. A pump with a velocity of 7 feet per second will pump water only to a maximum height of 76.6 feet. Therefore, this pump will not meet the fire department s need. c. To determine the height of the water, substitute 77 for v in the function. A pump with a velocity of 77 feet per second will pump water to a maximum height of 9.6 feet. Therefore, this pump will meet the fire department s need. Simplify each expression. 7. Page
13 -ASimplifying pump with aradical velocityexpressions of 77 feet per second will pump water to a maximum height of 9.6 feet. Therefore, this pump will meet the fire department s need. Simplify each expression Page
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19 - Simplifying Radical Expressions ELECTRICITY The amount of current in amperes I that an appliance uses can be calculated using the formula, where P is the power in watts and R is the resistance in ohms. a. Simplify the formula. b. How much current does an appliance use if the power used is 75 watts and the resistance is 5 ohms? a. b. Substitute P = 75 and R = 5 in the equation. An appliance uses about.9 amps of current if the power used is 75 watts and the resistance is 5 ohms. 5. KINETIC The speed esolutions Manual - ENERGY Powered by Cognero v of a ball can be determined by the equation energy and m is the mass of the ball. a. Simplify the formula if the mass of the ball is kilograms., where k is the kinetic Page 9
20 - Simplifying Radical Expressions An appliance uses about.9 amps of current if the power used is 75 watts and the resistance is 5 ohms. 5. KINETIC ENERGY The speed v of a ball can be determined by the equation, where k is the kinetic energy and m is the mass of the ball. a. Simplify the formula if the mass of the ball is kilograms. b. If the ball is traveling 7 meters per second, what is the kinetic energy of the ball in Joules? a. If the mass of the ball is kilograms, substitute m = into the equation. b. Substitute V = 7 in the equation. The kinetic energy of the ball is 7.5 Joules. 5. SUBMARINES The greatest distance d in miles that the lookout can see on a clear day is modeled by the formula. Determine how high the submarine would have to raise its periscope to see a ship, if the submarine is the given distances away from a ship. Page
21 - Simplifying Radical Expressions The kinetic energy of the ball is 7.5 Joules. 5. SUBMARINES The greatest distance d in miles that the lookout can see on a clear day is modeled by the formula. Determine how high the submarine would have to raise its periscope to see a ship, if the submarine is the given distances away from a ship. First solve the equation for h. Distance Height = d h= 6 () = 6 h = 9 (6) = 4 5. CCSS STRUCTURE Explain how to solve h= (9) = 54 h= 5 () = 96 h= (5) = 5. To solve an equation of equal ratios, first find the equal cross products and then solve for the variable. Page
22 Distance 6 Height = d h = () = 6 h = - Simplifying Radical Expressions 9 (6) = 4 h= 5. CCSS STRUCTURE Explain how to solve (9) = 54 h= 5 () = 96 h= (5) = 5. To solve an equation of equal ratios, first find the equal cross products and then solve for the variable. Use the conjugate of to rationalize the denominator. So, the solution is. 5. CHALLENGE Simplify each expression. a. b. c. a. b. c. 54. REASONING Marge takes a number, subtracts 4, multiplies by 4, takes the square root, and takes the reciprocal to get. What number did she start with? Write a formula to describe the process. Page
23 b. - Simplifying Radical Expressions c. 54. REASONING Marge takes a number, subtracts 4, multiplies by 4, takes the square root, and takes the reciprocal to get. What number did she start with? Write a formula to describe the process. Let x = a number. 55. OPEN ENDED Write two binomials of the form and. Then find their product. Two binomials of the form and are and. 56. CHALLENGE Use the Quotient Property of Square Roots to derive the Quadratic Formula by solving the quadratic equation ax + bx + c =. (Hint: Begin by completing the square.) Page
24 Two binomials of the form and are and. - Simplifying Radical Expressions 56. CHALLENGE Use the Quotient Property of Square Roots to derive the Quadratic Formula by solving the quadratic equation ax + bx + c =. (Hint: Begin by completing the square.) 57. WRITING IN MATH Summarize how to write a radical expression in simplest form. No radicals can appear in the denominator of a fraction. So, rationalize the denominator to get rid of the radicand in the denominator. Then check if any of the radicands have perfect square factors other than. If so, simplify. For example, simplify the following. 58. Jerry s electric bill is $ less than his natural gas bill. The two bills are a total of $9. Which of the following Page 4
25 - Simplifying Radical Expressions 57. WRITING IN MATH Summarize how to write a radical expression in simplest form. No radicals can appear in the denominator of a fraction. So, rationalize the denominator to get rid of the radicand in the denominator. Then check if any of the radicands have perfect square factors other than. If so, simplify. For example, simplify the following. 58. Jerry s electric bill is $ less than his natural gas bill. The two bills are a total of $9. Which of the following equations can be used to find the amount of his natural gas bill? A g + g = 9 B + g = 9 C g = 9 D g = 9 Let g = Jerry s natural gas bill. Jerry s electric bill is $ less than his natural gas bill, so the electric bill is g. The two bills are a total of $9. So, the correct choice is D. 59. Solve a a + = 5. F 4, 6 G 4, 6 H 4, 6 J 4, 6 Solve for a. Page 5
26 Let g = Jerry s natural gas bill. Jerry s electric bill is $ less than his natural gas bill, so the electric bill is g. The two bills are a total of $9. - Simplifying Radical Expressions So, the correct choice is D. 59. Solve a a + = 5. F 4, 6 G 4, 6 H 4, 6 J 4, 6 Solve for a. The roots are 4 and 6. So, the correct choice is H. 6. The expression is equivalent to which of the following? A B C D So, the correct choice is C. 6. GRIDDED RESPONSE Miki earns $ an hour and % commission on sales. If Miki worked 8 hours and had a total sales of $75 last week, how much did she make? Miki s earnings are $ per hour and % commission on sales. Miki made $57.5 last week. Graph each function. Compare to the parent graph. State the domain and range. 6. Page 6
27 - Simplifying Radical Expressions So, the correct choice is C. 6. GRIDDED RESPONSE Miki earns $ an hour and % commission on sales. If Miki worked 8 hours and had a total sales of $75 last week, how much did she make? Miki s earnings are $ per hour and % commission on sales. Miki made $57.5 last week. Graph each function. Compare to the parent graph. State the domain and range. 6. x y.8 The parent function a vertical stretch of }..5 4 is multiplied by a value greater than and is subtracted by the value, so the graph is followed by a translation unit down. The domain is {x x }, and the range is {y y - 6. x y.7 The parent function.9 4 is multiplied by a value less than and greater than, so the the graph is a vertical compression of. Another way to identify the compression is to notice that the y-values in the table are times the corresponding y-values for the parent function. The domain is {x x } and the range is {y y }. Page 7
28 is multiplied by a value greater than and is subtracted by the value, so the graph is The parent function a vertical stretch of followed by a translation unit down. The domain is {x x }, and the range is {y y - Simplifying Radical Expressions }. 6. x y.7 The parent function.9 4 is multiplied by a value less than and greater than, so the the graph is a vertical compression of. Another way to identify the compression is to notice that the y-values in the table are times the corresponding y-values for the parent function. The domain is {x x } and the range is {y y }. 64. x y This graph is the result of a vertical stretch of the graph of y = is {x x }, and the range is {y y }. followed by a translation units left. The domain 65. x y.4.7 Page 8
29 graph is the result Expressions of a vertical stretch of the graph of y = -This Simplifying Radical is {x x }, and the range is {y y }. followed by a translation units left. The domain 65. x y.4.7 This graph is the result of a reflection across the x-axis of the graph of The domain is {x x }, and the range is {y y }. followed by a translation unit left. 66. x y This graph is the result of a vertical stretch of the graph of followed by a reflection across the x-axis, and then a translation units right. The domain is {x x }, and the range is {y y }. 67. x y.8.5 Page 9
30 graph is the result Expressions of a vertical stretch of the graph of followed by a reflection across the x-axis, and -This Simplifying Radical then a translation units right. The domain is {x x }, and the range is {y y }. 67. x y.8.5 is multiplied by a value less than and is added to the value, so the graph is a vertical The parent function stretch of followed by a reflection across the x-axis, and then a translation unit up. The domain is {x x }, and the range is {y y }. Determine the domain and range for each function. 68. f (x) = x 5 Since f (x) cannot be negative, the minimum point of the graph is where f (x) =. Make a table of values. x f (x) 5 4 The domain is all real numbers, and the range is {y y }. 69. h(x) = x Page
31 is multiplied by a value less than and is added to the value, so the graph is a vertical The parent function of followed by a reflection across the x-axis, and then a translation unit up. The domain is {x x -stretch Simplifying Radical Expressions }, and the range is {y y }. Determine the domain and range for each function. 68. f (x) = x 5 Since f (x) cannot be negative, the minimum point of the graph is where f (x) =. Make a table of values. x f (x) 5 4 The domain is all real numbers, and the range is {y y }. 69. h(x) = x Since h(x) cannot be negative, the minimum point of the graph is where h(x) =. Make a table of values. x 4 h(x) 5 4 Page
32 The domain is all real numbers, and the range is {y y }. - Simplifying Radical Expressions 69. h(x) = x Since h(x) cannot be negative, the minimum point of the graph is where h(x) =. Make a table of values. x 4 h(x) 5 4 The domain is all real numbers, and the range is {y y }. 7. This is a piecewise-defined function. Make a table of values. Be sure to include the domain values for which the function changes. x g(x) Notice that both functions are linear. The domain is all real numbers, and the range is {y y }. Solve each equation by using the Quadratic Formula. Round to the nearest tenth if necessary. 7. x 5 = Page
33 domain isradical all real numbers, and the range is {y y }. -The Simplifying Expressions 7. This is a piecewise-defined function. Make a table of values. Be sure to include the domain values for which the function changes. x g(x) Notice that both functions are linear. The domain is all real numbers, and the range is {y y }. Solve each equation by using the Quadratic Formula. Round to the nearest tenth if necessary. 7. x 5 = For this equation, a =, b =, and c = 5. The solutions are 5 and r + 5 = For this equation, a =, b =, and c = 5. Page
34 -The Simplifying solutions Radical are 5 andexpressions r + 5 = For this equation, a =, b =, and c = 5. There are no real positive square roots of. Therefore, the solution to this equation is ø. 7. 4w + = 4w Rewrite the equation in standard form. For this equation, a = 4, b = 4, and c =. The solution is r + r 4 = For this equation, a =, b =, and c = 4. Page 4
35 - Simplifying Radical Expressions The solution is r + r 4 = For this equation, a =, b =, and c = 4. The solutions are.9 and v 7v = Rewrite the equation in standard form. For this equation, a = 5, b = 7, and c =. The solutions are. and z z = Rewrite the equation in standard form. For this equation, a =, b =, and c =. Page 5
36 - Simplifying Radical Expressions The solutions are. and z z = Rewrite the equation in standard form. For this equation, a =, b =, and c =. The solutions are.5 and.6. Factor each polynomial, if possible. If the polynomial cannot be factored, write prime. 77. n a x 98x 4 8. x y 4 Page 6
37 - Simplifying Radical Expressions 4 8. x y t 7 In this trinomial, a = 4, b = and c = 7, so m + p is zero and mp is negative. Therefore, m and p must be opposite signs. List the factors of 4( 7) or 8 with a sum of. Factors of 8 Sum of, 8 7 7, 8, 5 5 5, 5, 6, 6 4, 7 4, 7 6, 8 6, 8 9, 9, There are no factors of 8 with a sum of, so 4t 7 is prime. 8. x x 9x POPULATION The country of Latvia has been experiencing a.% annual decrease in population. In 9, its population was,6,94. If the trend continues, predict Latvia s population in 9. Use the equation for exponential decay, with a =,6,94, r =., and t =. Latvia s population in 9 will be about,4,5 people. esolutions Manual - Powered by Cognero There are more 84. TOMATOES than, varieties of tomatoes. One seed company produces seed packages Page for 7 varieties of tomatoes. For how many varieties do they not provide seeds?
38 - Simplifying Radical Expressions Latvia s population in 9 will be about,4,5 people. 84. TOMATOES There are more than, varieties of tomatoes. One seed company produces seed packages for varieties of tomatoes. For how many varieties do they not provide seeds? Let t be the number of varieties of tomatoes for which the seed company does not produce. Since the seed company produces packages for varieties, the total number of varieties can be expressed as: t +. Since there are more than, varieties of tomatoes: t + >,. Solving, we get: t >, - t > 9,8 Write the prime factorization of each number The number is prime. So, the prime factorization of is Page 8
10-2 Simplifying Radical Expressions. Simplify each expression. SOLUTION: 4. SOLUTION: SOLUTION: SOLUTION: 10. MULTIPLE CHOICE Which expression is
2. Simplify each expression. 10. MULTIPLE CHOICE Which expression is equivalent to? A B 4. C D 6. 8. 12. The correct choice is D. Simplify each expression. esolutions Manual - Powered by Cognero Page 1
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