# Lesson 7.1 Polynomial Degree and Finite Differences

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1 Lesson 7.1 Polynomial Degree and Finite Differences 1. Identify the degree of each polynomial. a. 1 b c Determine which of the epressions are polynomials. For each polynomial, state its degree and write it in general form. If it is not a polynomial, eplain why not. a b. 1 2 c The figures below show why the numbers in the sequence 1, 3, 6, 10,... are called triangular numbers. a. Complete the table. n nth triangular number b. Calculate the finite differences for the completed table. c. What is the degree of the polynomial function that you would use to model this data set? d. Write a polynomial function t that gives the nth triangular number as a function of n. (Hint: Create and solve a system of equations to find the coefficients.) Discovering Advanced Algebra More Practice Your Skills CHAPTER Key Curriculum Press

3 Lesson 7.3 Completing the Square 1. Factor each quadratic epression. a b c y 16y 2 2. What value is required to complete the square? a b. 2 c Convert each quadratic function to verte form by completing the square. a. y b. y c. y Find the verte of the graph of each quadratic function, and state whether the verte is a maimum or a minimum. a. y ( 2)( 6) b. y c. y Rewrite each epression in the form a 2 b c, and then identify the coefficients a, b, and c. a b. 2( 8) c. (2 3)( ) 6. A ball is thrown up and off the roof of a 7 m tall building with an initial velocity of 14.7 m/s. a. Let t represent the time in seconds and h represent the height of the ball in meters. Write an equation that models the height of the ball. b. At what time does the ball reach maimum height? What is the ball s maimum height? c. At what time does the ball hit the ground? Discovering Advanced Algebra More Practice Your Skills CHAPTER 7 43

4 Lesson 7.4 The Quadratic Formula 1. Evaluate each epression. Round your answers to the nearest thousandth. a (1)( ) b. 4 ( 4) 2 4(2)(1) 2(1) 2(2) c. ( ) 2 4(4)( 3) 2(4) d (2)() 2(2) 2. Solve by any method. Give your answers in eact form. a b c d e. 2.8 f Use the quadratic formula to find the zeros of each function. Then, write each equation in factored form, y a r 1 r 2, where r 1 and r 2 are the zeros of the function. a. y 2 24 b. y c. y Write a quadratic function in general form that satisfies the given conditions. a. a 1; -intercepts of graph are 4 and 2 b. -intercepts of graph are 0 and 13; graph contains point (2, 22) c. -intercept of graph is 4.8; y-intercept is CHAPTER 7 Discovering Advanced Algebra More Practice Your Skills

5 Lesson 7. Comple Numbers 1. Add, subtract, or multiply. a. ( 6i ) (1 i ) b. ( 2.4.6i) (.9 1.8i) c. 4i( 6 i ) d. (2. 1.i)( i) 2. Find the conjugate of each comple number. a. 4i b. 7i c i 3. Rewrite each quotient in the form a bi. a. 2 b. 1 i 3 i 1 i c. 3 i 6i 4. Solve each equation. Use substitution to check your solutions. Label each solution as real, imaginary, and/or comple. a b c. ( ) 1 d e f. ( 7)( 3) 2. Write a quadratic function in general form that has the given zeros and leading coefficient of 1. a. 4, 7 b. 11i, 11i c. 2 3i, 2 3i 6. Name the comple number associated with each point, A through C, on the comple plane shown. C Imaginary A Real B Discovering Advanced Algebra More Practice Your Skills CHAPTER 7 4

6 Lesson 7.6 Factoring Polynomials 1. Without graphing, find the -intercepts and the y-intercept for the graph of each equation. a. y ( 8) 2 b. y 3( 4)( 2) c. y 0.7( 2)( 6) 2. Write the factored form of the quadratic function for each graph. Don t forget the vertical scale factor. a. y b. y (0, 24) ( 3, 0) (4, 0) ( 4, 0) (2, 0) 20 (0, 4) 3. Convert each polynomial function to general form. a. y 2( 2.)( 2.) b. y 0.( 3) 2 c. y ( 12)( 12) 4. Write each polynomial as a product of factors. Some factors may include irrational numbers. a b c d. 2 1 e f Sketch a graph for each situation if possible. a. A quadratic function with two real zeros, whose graph has the line 2 as its ais of symmetry b. A cubic function with three real zeros, whose graph has a positive y-intercept 46 CHAPTER 7 Discovering Advanced Algebra More Practice Your Skills

7 Lesson 7.7 Higher-Degree Polynomials 1. Refer to these two graphs of polynomial functions. i. y ii. y ( 3, 0) (2, 0) (0, 0) (0, 4) ( 2, 0) (2, 0) a. Identify the zeros of each function. b. Find the y-intercept of each graph. c. Identify the lowest possible degree of each polynomial function. d. Write the factored form for each polynomial function. Check your work by graphing on your calculator. 2. Write a polynomial function with the given features. a. A quadratic function whose graph has verte (3, 8), which is a minimum, and two -intercepts, one of which is b. A fourth-degree polynomial function with two double roots, 0 and 2, and whose graph contains the point (1, 1) 3. Write the lowest-degree polynomial function that has the given set of zeros and whose graph has the given y-intercept. Write each polynomial function in factored form. Give the degree of each function. a. Zeros: 3, ; y-intercept: 30 b. Zeros: 2i, 2 (double root), ; y-intercept: 80 Discovering Advanced Algebra More Practice Your Skills CHAPTER 7 47

8 Lesson 7.8 More About Finding Solutions 1. Divide. a. 2 ) b. 4 ) Varsha started out dividing two polynomials by synthetic division this way: a. Identify the dividend and divisor. b. Write the numbers that will appear in the second line of the synthetic division. c. Write the numbers that will appear in the last line of the synthetic division. d. Write the quotient and remainder for this division. 3. In each division problem, use the polynomial that defines P as the dividend and the binomial that defines D as the divisor. Write the result of the division in the form P() D() Q() R, where the polynomial that defines Q is the quotient and R is an integer remainder. (It is not necessary to write the remainder if R 0.) a. P() ; D() b. P() ; D() 1 4. Make a list of the possible rational roots of each equation. a b Find all the zeros of each polynomial function. Then write the function in factored form. a. y b. y CHAPTER 7 Discovering Advanced Algebra More Practice Your Skills

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