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Polynomial functions of Higher degree Chapter 2.2

Learn how to recognize the basic features of polynomial function graphs and make accurate sketches by hand using symmetry, intercepts, and point plotting. |

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Polynomial functions of Higher degree Chapter 2.2

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  1. You should be able to sketch the graphs of a polynomial function of: Degree 0, a Constant Function Degree 1, a Linear Function Degree 2, a Quadratic Function In this section you will learn how to recognize some of the basic features of graphs of polynomial functions. Using those features, point plotting, intercepts and symmetry you should be able to make reasonably accurate sketches by hand. Polynomial functions of Higher degreeChapter 2.2

  2. y y y 2 2 2 x x x –2 –2 –2 Polynomial functions of Higher degreeChapter 2.2 Polynomial functions are continuous Functions with graphs that are not continuous are not polynomial functions (Piecewise) Polynomial functions have graphs with smooth , rounded turns. They are continuous Graphs of polynomials cannot have sharp turns (Absolute Value)

  3. y 2 x –2 Polynomial functions of Higher degreeChapter 2.2 The polynomial functions that have the simplest graphs are monomials of the form If n is even-the graph is similar to If n is odd-the graph is similar to For n-odd, greater the value of n, the flatter the graph near(0,0)

  4. y 2 x –2 Transformations of Monomial Functions Example 1: The degree is odd, the negative coefficient reflects the graph on the x-axis, this graph is similar to

  5. y 2 x –2 Example 2: (Goes through Point (0,1)) Transformations of Monomial Functions The degree is even, and has as upward shift of one unit of the graph of

  6. y 2 x –2 Example 3: (Goes through points (0,1),(-1,0),(-2,1)) Transformations of Monomial Functions The degree is even, and shifts the graph of one unit to the left.

  7. y 2 x –2 Leading Coefficient Test When n is odd: If the leading coefficient is negative The graph rises to the left and falls to the right If the leading coefficient is positive The graph falls to the left and rises to the right The graph of a polynomial eventually rises or falls. This can be determined by the functions degree odd or even) and by its leading coefficient

  8. y 2 x –2 When n is even: Leading Coefficient Test If the leading coefficient is negative The graph falls to the left and falls to the right If the leading coefficient is positive The graph rises to the left and rises to the right

  9. Even Odd + -

  10. y 2 x –2 Use the leading coefficient test to describe left and right hand behavior of the graph Applying the leading coefficient test Example 1 Verify the answer on you calculator

  11. y 2 x –2 Use the leading coefficient test to describe left and right hand behavior of the graph Applying the leading coefficient test Example 2 Verify the answer on you calculator

  12. y 2 x –2 Use the leading coefficient test to describe left and right hand behavior of the graph Applying the leading coefficient test Example 3 Verify the answer on you calculator

  13. Given: Degree?______ Leading Coefficient Test Right side___ Left Side___ Does it shift?________ Draw the graph! Review of Yesterday

  14. Multiplicity of Zeros How many zeros do you expect? How many zeros do you expect? How many zeros do you get? How many zeros do you get? What do those zeros look like? What do those zeros look like?

  15. The possible number of zeros in any quadratic rely on what?

  16. How many zeros do you expect? How many zeros do you expect? How many zeros do you get? How many zeros do you get? What do those zeros look like? What do those zeros look like?

  17. Name the number of zeros and multiplicities in this 6th degree function:

  18. For a polynomial function f of degree n • The function f has at most n real zeros. • The graph of f has at most n-1 relative extrema (relative minima or maxima) • For example: • Has at most ______ real zeros • Has at most ______ relative extrema Zeros of Polynomial functions

  19. Example: Has at most ______ real zeros Has at most ______ relative extrema Solution: Write the original function Substitute 0 for y Remove common factor Factor Completely So, the real zeros are x=0,x=2, and x=-1 And, the corresponding x-intercepts are: (0,0),(2,0),(-1,0) Finding Zeros of a Polynomial function(This is very similar to finding the x-intercepts)

  20. Practice: Has at most ______ real zeros Has at most ______ relative extrema Solution: So, the real zeros are: x=____________ And, the corresponding x-intercept are: ( , ),( , ) Finding Zeros of a Polynomial function(This is very similar to finding the x-intercepts)

  21. Finding Zeros of a Polynomial Functions • Find all zeros of graphically.

  22. Find polynomial functions with the following zeros. (there are many correct solutions). -1/2, 3, 3 Finding a Polynomial Function with Given Zeros

  23. Finding a Polynomial Function with Given Zeros

  24. Intermediate Value Theorem Let a and b be real numbers such that a<b. If f is a polynomial function such that , then in the interval [a,b], f takes on every value between and The Intermediate Value Theorem

  25. #73 Use the Intermediate Value Theorem and a graphing calculator to list the integers that zeros of the function lie within.

  26. Homework • Page 112-114 1-79 odd

  27. The End Of Section 2.2

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