March 29, S4.4 Theorems about Zeros of Polynomial Functions


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1 MAT 171 Precalculus Algebra Dr. Claude Moore Cape Fear Community College CHAPTER 4: Polynomial and Rational Functions 4.1 Polynomial Functions and Models 4.2 Graphing Polynomial Functions 4.3 Polynomial Division; The Remainder and Factor Theorems 4.4 Theorems about Zeros of Polynomial Functions 4.5 Rational Functions 4.6 Polynomial and Rational Inequalities See the following lesson in Course Documents of CourseCompass: 171Session4 171Session4 ( Package file ) This lesson is a brief discussion of and suggestions relative to studying Chapter Theorems about Zeros of Polynomial Functions Find a polynomial with specified zeros. For a polynomial function with integer coefficients, find the rational zeros and the other zeros, if possible. Use Descartes rule of signs to find information about the number of real zeros of a polynomial function with real coefficients. The Fundamental Theorem of Algebra Every polynomial function of degree n, with n 1, has at least one zero in the system of complex numbers. The Fundamental Theorem of Algebra Example: Find a polynomial function of degree 4 having zeros 1, 2, 4i, and 4i. Solution: Such a polynomial has factors (x 1),(x 2), (x 4i), and (x + 4i), so we have: Let a n = 1: 1
2 Zeros of Polynomial Functions with Real Coefficients Nonreal Zeros: If a complex number a + bi, b 0, is a zero of a polynomial function f(x) with real coefficients, then its conjugate, a bi, is also a zero. (Nonreal zeros occur in conjugate pairs.) Irrational Zeros: If where a, b, and c are rational and b is not a perfect square, is a zero of a polynomial function f(x) with rational coefficients, then its conjugate is also a zero. Example Suppose that a polynomial function of degree 6 with rational coefficients has 3 + 2i, 6i, and as three of its zeros. Find the other zeros. Solution: The other zeros are the conjugates of the given zeros, 3 2i, 6i, and There are no other zeros because the polynomial of degree 6 can have at most 6 zeros. Rational Zeros Theorem Let where all the coefficients are integers. Consider a rational number denoted by p/q, where p and q are relatively prime (having no common factor besides 1 and 1). If p/q is a zero of P(x), then p is a factor of a 0 and q is a factor of a n. Example Given f(x) = 2x 3 3x 2 11x + 6: a) Find the rational zeros and then the other zeros. b) Factor f(x) into linear factors. Solution: a) Because the degree of f(x) is 3, there are at most 3 distinct zeros. The possibilities for p/q are: 2
3 Use synthetic division to help determine the zeros. It is easier to consider the integers before the fractions. We try 1: We try 1: We try 3: Since f(1) = 6, 1 is not a zero. Since f( 1) = 12, 1 is not a zero. Since f(3) = 0, 3 is a zero. Thus x 3 is a factor. Using the results of the division above, we can express f(x) as We can further factor 2x2 + 3x 2 as (2x 1)(x + 2).. Descartes Rule of Signs The rational zeros are 2, 3 and The complete factorization of f(x) is: Let P(x) be a polynomial function with real coefficients and a nonzero constant term. The number of positive real zeros of P(x) is either: 1. The same as the number of variations of sign in P(x), or 2. Less than the number of variations of sign in P(x) by a positive even integer. The number of negative real zeros of P(x) is either: 3. The same as the number of variations of sign in P( x), or 4. Less than the number of variations of sign in P( x) by a positive even integer. A zero of multiplicity m must be counted m times. 3
4 Example What does Descartes rule of signs tell us about the number of positive real zeros and the number of negative real zeros? There are two variations of sign, so there are either two or zero positive real zeros to the equation. There are two variations of sign, so there are either two or zero negative real zeros to the equation. Total Number of Zeros (or Roots) = 4: Possible number of zeros (or roots) by kind: Positive Negative Nonreal /4. Find a polynomial function of degree 3 with the given numbers as zeros: 2, i, i 339/8. Find a polynomial function of degree 3 with the given numbers as zeros: 4, 1 5, n = 3; x = 2, x = i, x = i f(x) = (x 2)(x i)(x + i) = (x 2)(x 2 + 1) f(x) = x 3 2x 2 + x 2 4
5 339/14. Find a polynomial function of degree 4 with 2 as a zero of multiplicity 1, 3 as a zero of multiplicity 2, and 1 as a zero of multiplicity /24. Suppose that a polynomial function of degree 4 with rational coefficients has the given numbers as zeros. Find the other zero(s): 6 5i, We only needed to find the other roots or zeros. We did not need to find the polynomial function. 340/29. Suppose that a polynomial function of degree 5 with rational coefficients has the given numbers as zeros. Find the other zero(s): 6, 3 + 4i, 4 5 n = 5 means that the polynomial function has 5 roots (zeros) when we include complex solutions (roots or zeros). x = 6, x = 3 + 4i, and x = 4 5 are given as three roots (zeros). Since x = 3 + 4i is a root, we know that the conjugate x = 3 4i is a root. 340/36. Find a polynomial function of lowest degree with rational coefficients that has the given numbers as some of its zeros: 5i Find the polynomial function with lowest degree (smallest n) that has x = 5i as a root (zero). The conjugate x = 5i is also a root (zero) of the function. Thus, we can write f(x) = (x + 5i )(x 5i ) = x Since x = 4 5 is a root, we know that the conjugate x = is a root. Therefore, the five (5) roots (zeros) are x = 6, x = 3 + 4i, x = 3 4i, x = 4 5, and x =
6 340/46. Given that the polynomial function has the given zero, find the other zeros: f(x) = x 4 16; 2i 340/52. List all possible rational zeros of the function: f(x) = 3x 3 x 2 + 6x 9 340/62. For each polynomial function: a) Find the rational zeros and then the other zeros; that is, solve f(x) = 0. b) Factor f(x) into linear factors. f(x) = 3x 4 4x 3 + x 2 + 6x 2 NOTE: The original problem was copied wrong. The roots are x = 1, x = 1/3, x = 2i, and x = 2i. 340/69. For each polynomial function: a) Find the rational zeros and then the other zeros; that is, solve f(x) = 0. b) Factor f(x) into linear factors. f(x) = (1/3)x 3 (1/2)x 2 (1/6)x + 1/6 Other roots are 2i and 2i. 6
7 340/74. Find only the rational zeros of the function. f(x) = 2x 3 + 3x 2 + 2x /76. Find only the rational zeros of the function. f(x) = x 4 + 6x x x + 66 q {±1} p {±1, 2, 3, 6, 11, 22, 33, 66} I tried all 16 possible rational roots and found that none of them worked. So, f(x) has NO rational roots. 341/82. What does Descartes rule of signs tell you about the number of positive real zeros and the number of negative real zeros of the function? P(x) = 3x 5 7x 3 4x 5 341/86. What does Descartes rule of signs tell you about the number of positive real zeros and the number of negative real zeros of the function? g(z) = z z 7 + z 3 + 6z 1 7
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