Polynomials 6c Classifying the Zeros of a Polynomial Functions
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1 Polynomials 6c Classifying the Zeros of a Polynomial Functions Standards: A APR.2, A APR.3, F IF.7c, N CN.9 Learning Target(s): How many zeros does a polynomial have? How can we find all the exact zeros given a graph? Oct 30 9:18 PM 1
2 (erase to show) The Fundamental Theorem of Algebra states that every nth degree polynomial has exactly n zeros. In some cases, a zero of a polynomial may be repeated. For example, the function has three zeros: x=1, 3, & 3 > In this case, we say, f(x) has zeros at x=1 and x=3 (multiplicity 2). This means that instead of crossing the x axis at x=3, the graph of f(x) will have a point of tangency at x=3. If a polynomial has complex zeros, they will always happen in pairs. > If a + bi is a zero of the function, then a bi will also be a zero of that function. These are called complex conjugates. > For example, the function has two complex zeros: 3 + 2i & 3 2i. Jan 28 9:39 PM 2
3 * Example 1: The graph of P(x) is shown below. P(x) is a 3rd degree polynomial (a cubic function). The scale used on the x axis is 1 unit. The scale used on the y axis is 2 units. Write the symbolic representation of P(x). Feb 13 8:04 PM 3
4 Example 2: (HW) The graph of R(x) is shown below. R(x) is a 3rd degree polynomial (a cubic function). The scale used on the x axis is 1 unit. The scale used on the y axis is 2 units. Write the symbolic representation of R(x). Feb 13 8:06 PM 4
5 * Example 3: The graph of C(x) is shown below. C(x) is a 4th degree polynomial (a quartic function). The scale used on the x axis is 1 unit. The scale used on the y axis is 2 units. Write the symbolic representation of C(x). Feb 13 8:08 PM 5
6 * Example 4: The graph of is shown below. k(x) is a 3rd degree polynomial (a cubic function). The scale used on the x axis is 1 unit. The scale used on the y axis is 10 units. Determine all the zeros of k(x). Feb 13 8:10 PM 6
7 * Example 5: The graph of L(x) is shown below. L(x) is a 7th degree polynomial. L(x) has two complex zeros. One of the complex zeros is x=3i. The scale used on the x axis is ½ unit. The scale used on the y axis is 500 units. Write the symbolic representation of L(x) and determine all the zeros. Feb 13 8:12 PM 7
8 Practice: For each of the following functions: First, use the symbolic representation of f(x) to determine the degree, the total number of zeros the function will have, the y intercept, and the endbehavior directions; Second, use the graph of f(x) to determine the number of Real zeros and the number of Complex zeros; Third, use the given zero and polynomial long division to determine all remaining zeros of f(x); Finally, express f(x) in factored form. Jan 22 9:35 PM 8
9 6. has one zero at x = 4 Using the symbolic representation of f(x): A. Degree of f(x): B. f(x) will have a total of zeros. C. y int of f(x): D. End behavior: Using the graph of f(x) note: the scale used on each axis is not provided E. # of Real zeros: F. # of Complex zeros: G. All zeros of f(x): H. f(x) expressed in factored form: Feb 13 8:18 PM 9
10 7. has one zero at x = 1 Using the symbolic representation of f(x): A. Degree of f(x): B. f(x) will have a total of zeros. C. y int of f(x): D. End behavior: Using the graph of f(x) note: the scale used on each axis is not provided E. # of Real zeros: F. # of Complex zeros: G. All zeros of f(x): H. f(x) expressed in factored form: Feb 13 8:18 PM 10
11 8. has one zero at x = 2 and one zero at x = 3 Using the symbolic representation of f(x): A. Degree of f(x): B. f(x) will have a total of zeros. C. y int of f(x): D. End behavior: Using the graph of f(x) note: the scale used on each axis is not provided E. # of Real zeros: F. # of Complex zeros: G. All zeros of f(x): H. f(x) expressed in factored form: Feb 13 8:18 PM 11
12 * 9. Using the symbolic representation of f(x): A. Degree of f(x): B. f(x) will have a total of zeros. C. y int of f(x): D. End behavior: Using the graph of f(x) note: the scale used on each axis is not provided E. # of Real zeros: F. # of Complex zeros: G. All zeros of f(x): H. f(x) expressed in factored form: Feb 13 8:18 PM 12
13 10. (HW) Using the symbolic representation of f(x): A. Degree of f(x): B. f(x) will have a total of zeros. C. y int of f(x): D. End behavior: Using the graph of f(x) note: the scale used on each axis is not provided E. # of Real zeros: F. # of Complex zeros: G. All zeros of f(x): H. f(x) expressed in factored form: Feb 13 8:18 PM 13
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