Polynomial Functions and Their Graphs

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Polynomial Functions and Their Graphs

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Presentation transcript:

Polynomial Functions and Their Graphs

Smooth, Continuous Graphs

Polynomial functions of degree 2 or higher have graphs that are smooth and continuous. By smooth, we mean that the graphs contain only rounded curves with no sharp corners. By continuous, we mean that the graphs have no breaks and can be drawn without lifting your pencil from the rectangular coordinate system.

Notice the breaks and lack of smooth curves.

End Behavior of Polynomial Functions

Odd-degree polynomial functions have graphs with opposite behavior at each end. Even-degree polynomial functions have graphs with the same behavior at each end.

Example Use the Leading Coefficient Test to determine the end behavior of the graph of f(x)= - 3x3- 4x + 7

Answer Use the Leading Coefficient Test to determine the end behavior of the graph of f(x)= - 3x3- 4x + 7

Example Use the Leading Coefficient Test to determine the end behavior of the graph of f(x)= - .08x4- 9x3+7x2+4x + 7

Answer Use the Leading Coefficient Test to determine the end behavior of the graph of f(x)= - .08x4- 9x3+7x2+4x + 7

Use the Leading Coefficient Test to determine the end behavior of the graph of the polynomial function f(x)=x3- 9x2 +27 (a) (b) (c) (d)

ANSWER: f(x)=x3- 9x2 +27 (a) (b) (c) (d)

Turning Points of Polynomial functions

The graph of f(x)=x5- 6x3+8x+1 is shown below The graph of f(x)=x5- 6x3+8x+1 is shown below. The graph has four smooth turning points. The polynomial is of degree 5. Notice that the graph has four turning points. In general, if the function is a polynomial function of degree n, then the graph has at most n-1 turning points.

Determine the maximum number of turning points of the graph of the polynomial function f(x)=-7x6- 5x4 +x +9

Determine the maximum number of turning points of the graph of the polynomial function f(x)=-7x6- 5x4 +x +9 5