# 9 RATIONAL FUNCTIONS TEST REVIEW 2017 - Loudoun County Public Schools

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RATIONAL FUNCTIONS TEST REVIEW Name: SECTION 1: OPERATIONS OF RATIONAL EXPRESSIONS Complete the operation or simplify. 1. 4x 12 2 x 2x 15 2. 15x3 y5 6xy3 2xy 9x 4 y 3. 8x 3 125 x 5 2 2x 5 x 25 4. x 2 6x x 2 2x 8 2 x 8x 12 x 3 8

5. x 2 9x 22 x 2 5x 24 x 2 x 3 7. 5x x 3 x 2 x 2 6. 4x 4x 1 x 3 x 3 8. 5x 2 3y 15

9. 2x 5 2 x 3 x 3x Factor each expression completely. 11. 64x2 – 121 13. 6x2 – 7x – 5 x 10. x2 x 12. x3 – 125 14. x2 – 15x 50 12 5 12x 48

15. 3x3 – 24 16. x2 – 13x – 30 17. 27x3 64 18. x2 – 1 19. x2 – 64x 20. 20x2 26x – 6 21. 24x4 – 8x3 4x 22. 4x2 49 23. 3x2 24x 48 24. 25x2 – 60x 36

SECTION 2: GRAPHING RATIONAL FUNCTIONS 1. How do you find a vertical asymptote of a rational function? 2. How do you find a horizontal asymptote when graphing if the degree is larger on the denominator? 3. How do you find a horizontal asymptote when graphing if the degree of the numerator is the same as the degree of the denominator? 4. How do you find a removable discontinuity of a rational function? 5. How do you find the domain and range of a rational function? 6. How do you find the degree of a polynomial in standard form? 7. How do you find the degree of a polynomial in factored form? Circle the asymptotes of the following function. 8. y x 1 9. y x 5 Circle all that apply. 3 4 x 1 x –1 x 4 y 3 y 1 y 4 x –5 y 0 y 1 y 5 10 x 2 25 x 0

10. Identify the vertical asymptote, horizontal asymptote, domain and range of each equation. Vertical Asymptote Horizontal Asymptote Domain Range a. b. c. d. Identify the vertical asymptote, horizontal asymptote, domain and range of the graph. 11. 12. Vertical Asymptote: Vertical Asymptote: Horiztonal Asymptote: Horiztonal Asymptote: Domain: Domain: Range: Range:

13. y 6 1 x 2 VA: Domain: HA: Range: 14. Table Graph Table Graph f (x) 2x x 5 VA: Domain: HA: Range:

15. f (x) 3x 2 3 x2 9 VA: Domain: HA: Range: 16. x2 9 f (x) 2 x 8x 15 VA: Domain: HA: Range: Table Graph Table Graph

VARIATION VARIATION: 1. Direct variation formula: 2. Inverse variation formula: 3. Joint variation formula: Determine if the equation or situation represents direct, inverse, or joint variation, or neither. 4. d kst 5. m k r 6. s kpr 7. a 5 b 8. y x 10 9. y s 7 Translate each situation into an equation. Do Not Solve! 10. An equation shows m is directly proportional to n and inversely proportional to s cubed. When m 5, then n 160 and s 2. What is the constant of proportionality? Write your answer as a fraction. 11. The weight, w, that a column of a bridge can support varies directly as the fourth power of its diameter, d, and inversely as the square of its length, l. 12. The number, n, of grapefruit that can fit into a box is inversely proportional to the cube of the diameter, d, of each grapefruit.

13. An equation shows m is directly proportional to n and inversely proportional to s cubed. When m –4, then n 160 and s 2. What is the constant of proportionality? 14. The variable z varies jointly with x and y. Write an equation relating x, y, and z when x -4, y 3, and z 2. 15. The amount of money earned at your job ( m ) varies directly with the number of hours (h) you work. The first day of work you earned 57 after working 6 hours. You are trying to save money to go to buy a new car to take to college next year. How many hours will you need to work in order to save 4750? 16. The force needed to keep a car from skidding on a curve varies jointly as the weight of the car and the square of the speed and inversely as the radius of the curve. Suppose a 3,960 lb. force is required to keep a 2,200 lb. car traveling at 30 mph from skidding on a curve of radius 500 ft. How much force is required to keep a 3,000 lb. car traveling at 45 mph from skidding on a curve of radius 400 ft.?

2xy 6xy3 9x4y 3. 8x3 . How do you find the domain and range of a rational function? 6. How do you find the degree of a polynomial in standard form? 7. How do you find the degree of a polynomial in factored form? Circle the asymptotes of the following function. Circle all that apply. 8. y 3 x 1 4

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Translate simple rational functions. Graph other rational functions. Graphing Simple Rational Functions A rational function has the form f(x) p(x) —, where q(x) p(x) and q(x) are polynomials and q(x) 0. The inverse variation function f(x) a — is a rational function. The graph x of this function when a 1 is shown below. Graphing a .

Translate simple rational functions. Graph other rational functions. Graphing Simple Rational Functions A rational function has the form f(x) p(x) —, where q(x) p(x) and q(x) are polynomials and q(x) 0. The inverse variation function f(x) a — is a rational function. The graph x of this function when a 1 is shown below. Graphing a .

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