Chapter 2 Polynomial and Rational Functions
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1 Chapter 2 Polynomial and Rational Functions Overview: 2.2 Polynomial Functions of Higher Degree 2.3 Real Zeros of Polynomial Functions 2.4 Complex Numbers 2.5 The Fundamental Theorem of Algebra 2.6 Rational Functions and Asymptotes 2.7 Graphs of Relational Functions 2.8 Exploring Data: Quadratic Models
2 2.2 Polynomial Functions of Higher Degree What You ll Learn: #24 - Use transformations to sketch graphs of polynomial functions. #25 - Use the Leading Coefficient Test to determine the end behavior of graphs of polynomial functions. #26 - Find and use zeros of polynomial functions as sketching aids. #28 - Use the Intermediate Value Theorem to help locate zeros of polynomial functions.
3 Exploration Use a graphing utility to graph y = x n for n = 2, 4, and 8. What general function do they all resemble? Graph y = x n for n = 3, 5, and 7. What general function do they all resemble? Graph each of the following: y = x n for n = 2,4, and 6 y = x n for n = 3,5, and 7
4 The Leading Coefficient Test For polynomial functions, y = x n when: n is odd Negative Coefficient f x as x f x as x n is even Negative Coefficient f x as x f x as x Positive Coefficient f(x) as x Positive Coefficient f(x) as x f x as x f(x) as x
5 Sketch the graph f x = x 5 g x = x h x = x + 1 4
6 Practice Indicate, for each, the behavior on both sides of the function. 1. y = x 3 2x 2 x y = 2x 5 + 2x 2 5x y = 2x 5 x 2 + 5x y = x 3 + 5x 2 5. y = 2x 2 + 3x 4 6. y = x 4 3x 2 + 2x 1 7. y = x 2 + 3x y = x 6 x 2 5x + 4
7 Zeros of Polynomial Functions By finding the zeros of a function, we can obtain a more accurate sketch of a polynomial s graph. Sketch the graph of f x = 3x 4 4x 3 by hand. 1. Apply the Leading Coefficient Test 2. Find the Zeros of the polynomial 3. Plot a few additional points
8 Sketch a graph Sketch the graph of f x = 2x 3 + 6x 2 9 x by hand. 2
9 The Intermediate Value Theorem Book Definition: Let a and b be real numbers such that a < b. If f is a polynomial function such that f(a) f(b), then in the interval [a, b], f takes on every value between f(a) and f(b). My Definition: If a function is continuous, and there exists an interval of both positive and negative values, then at some point in that interval the function has to take on the value of zero.
10 Approximating the Zeros of a Function Find three intervals of length 1 in which the polynomial f x = 12x 3 32x 2 + 3x + 5 is guaranteed to have a zero. Graphical Solution Numerical Solution (table)
11 Homework Page 108 #1-8,17-24,35-50,61,62
12 2.3 Real Zeros of Polynomial Functions What You Will Learn: #28 - Use long division to divide polynomials by other polynomials. #29 - Use synthetic division to divide polynomials by binomials of the form (x k). #30 - Use the Remainder and Factor Theorems. #31 - Use the Rational Zero Test to determine possible rational zeros of polynomial functions. #32 - Use Descartes s Rule of Signs and the Upper and Lower Bound Rules to find zeros of polynomials.
13 The Rational Zero Test The rational zero test is a quick way to determine if rational zeros exist. Here s the test: Possible rational zeros = factors of constant term factors of leading coefficient After you find the possible rational zeros, plug them in to test if they are, in fact, zeros! This may also be done by: Looking at the graph Looking at the table
14 Example Using the Rational Zero Test Find the rational zeros of f x = x 3 + x + 1.
15 Example Using the Rational Zero Test Find the rational zeros of f x = 2x 3 + 3x 2 8x + 3.
16 Example Using the Rational Zero Test Find the rational zeros of f x = 10x 3 15x 2 16x + 12.
17 Homework Page 123 #45-48,53 & 54 a only
18 2.4 Complex Numbers What You ll Learn: #33 - Use the imaginary unit i to write complex numbers. #34 Add, subtract, and multiply complex numbers. Use complex conjugates to write the quotient of two complex numbers in standard form. Plot complex numbers in the complex plane.
19 Complex Numbers Some equations fail to have real solutions. For example: x = 0 Although, we could use an imaginary number! 1 = i so x = 0 x 2 = 4 x = 4 x = 1 4 x = 1 4 x = 2i
20 The biggest group of all!
21 Complete the following i 1 = i i 2 = 1 i 3 = i i 4 = 1 i 5 = i 6 = i 7 = i 8 = i 9 = i 10 = i 11 = i 12 =
22 Standard Form a + bi Example: Rewrite 9 5 in standard i form ( 1) or 5 + 3i
23 Operations with Complex Numbers Add/subtract like terms only. Examples: 3 i + (2 + 3i) 2i + ( 4 2i) i + ( 5 + i) 3 + 2i + 4 i (7 + i)
24 Multiplying with Complex Numbers Re-write complex numbers in i form first! Examples: 4 16 (2 i)(4 + 3i) (3 + 2i)(3 2i)
25 Homework Page 133 #5-8,15-20,25-30
26 2.5 The Fundamental Theorem of Algebra What You ll Learn: #37 - Use the Fundamental Theorem of Algebra to determine the number of zeros of a polynomial function. #38 - Find all zeros of polynomial functions, including complex zeros. #39 - Find conjugate pairs of complex zeros. #40 - Find zeros of polynomials by factoring.
27 2.6 Rational Functions and Asymptotes What You ll Learn: #41 - Find the domains of rational functions. #42 - Find horizontal and vertical asymptotes of graphs of rational functions. #43 - Use rational functions to model and solve real-life problems.
28 Rational Functions A rational function f x is the quotient of two polynomials. f x = N x D x For whatever values of x for which D x = 0, this rational function will be undefined.
29 Consider the function f x = 1 x This is known as the reciprocal function. Domain: (, 0), (0, ) Range: (, 0), (0, ) No intercepts Odd function Vertical Asymptote: x = 0 Horizontal Asymptote y = 0
30 Definition of Vertical and Horizontal Asymptotes 1. The line x = a is a vertical asymptote of the graph of f if f(x) or f x as x a, either from the right or from the left. 2. The line y = b is a horizontal asymptote of the graph of f if f(x) b as x or x.
31 Horizontal and Vertical Asymptotes f x = 1 x f x as x 0 f x as x 0 + Vertical Asymptote at x = 0 f x 0 as x f x 0 as x Horizontal Asymptote at y = 0
32 f x = 2x + 1 x + 1
33 f x = 2 x 1 2
34 How to find vertical asymptotes Consider the typical rational function: f x = N x D(x) D(x) is the denominator function Where D x = 0, that is where you will have a vertical asymptote! Simply find the zeros of the denominator!
35 Exploration Graph these two functions: y 1 = 3x3 5x 2 +4x 5 2x 2 6x+7 y 2 = 3x3 2x 2
36 How to find horizontal asymptotes Consider the typical rational function: f x = N x D(x), the numerator and denominator are polynomials. Take the leading term from each to create a new rational function and reduce. You will look for two possibilities: 1. If the degree of the top function is LESS than the degree of the bottom function, then you will have a horizontal asymptote at y= If the degree of the top function is EQUAL to the degree of the bottom function, then you will have a horizontal asymptote at y = (whatever the coefficient is).
37 Examples Finding asymptotes f x = 2x 3x 2 +1 f x = 2x2 x 2 1
38 Examples Finding asymptotes f x = *change window* 2x 3x 2 +1 X 5 10 f(x)
39 Examples Finding asymptotes f x = 2x2 x 2 1 X 0.5 f(x) X 1.5 f(x)
40 Homework Page 148 #1,5,7-12,13,15,23
41 2.7 Graphs of Rational Functions What You ll Learn: #44 - Analyze and sketch graphs of rational functions. #45 - Sketch graphs of rational functions that have slant asymptotes. #46 - Use rational functions to model and solve real-life problems.
42 Guidelines for Graphing Rational Functions Let f x = N x D(x), where N(x) and D(x) are polynomials. 1. Simplify f, if possible 2. Find and plot the x and y intercepts a) Y-intercept is found by evaluating f(0). b) X-intercept is found by solving f x = Vertical asymptotes: find the zeros of the denominator, D x = 0. Then sketch the corresponding asymptotes using dashed vertical lines. 4. Horizontal Asymptotes: find and sketch the asymptotes as dashed lines. 5. Plot at least one point between and one point beyond the x-intercept and vertical asymptote. 6. Use smooth curves to complete the graph.
43 Examples Sketching Rational Functions Sketch the graph of h x = 3 x 2 by hand.
44 Examples Sketching Rational Functions Sketch the graph of g x = 2x 1 x by hand.
45 Examples Sketching Rational Functions Sketch the graph of f x = x x 2 x 2 by hand.
46 Examples Sketching Rational Functions Sketch the graph of f x = x2 9 x 2 2x 3 by hand.
47 Application Example 6 on Page 156 A rectangular page is designed to contain 48 square inches of print. The margins on each side of the page are inches wide. The margins at the top and bottom are each 1 inch deep. What should the dimensions of the page be so that the minimum amount of paper is used?
48 Homework Page 157 #9-11, 17, 20, 23, 27-30, 65
49 Math Art
50 2.8 Exploring Data: Quadratic Models What You ll Learn: #47 - Classify scatter plots. #48 - Use scatter plots and a graphing utility to find quadratic models for data. #49 - Choose a model that best fits a set of data. *Hand out*
51 Models for Data Linear Quadratic
52 Review Assignment - Chapter 2 Page 169 #13 & 14 A & B, 19-29, 55, 56, 65-72, , ,135,137-*141 *graphs on calculator
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