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08.07 Polynomial Functions

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ariana diaz

on 18 June 2014

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Transcript of 08.07 Polynomial Functions

g(x) = x^3 + 2x^2 – 9x – 18
(x^3+2x^2)(-9x-18) factor them
x^2(X+2) -9(x+2)
(x^2-9) (x+2)
(x-3)(x+3)(x+2)
x=3 x=-3 x=-2
(-3,0) (-2,0) (3,0)
08.07 Polynomial Functions
Esmeralda and Heinz both work in a science lab. In order to secure funding for their future experiments, they must present their findings to some investors. The investors are not interested in listening to formulas. They want to see graphs because they are visual people. Unfortunately, Esmeralda and Heinz are having some difficulties.

1)Esmeralda and Heinz are working to graph a polynomial function, f(x). Esmeralda says that the third-degree polynomial has four intercepts. Heinz argues that the function only crosses the x-axis three times. Is there a way for them both to be correct? Explain your answer.

2)Heinz has a list of possible functions. Pick one of the g(x) functions below, show how to find the zeros, and then describe to Heinz the other key features of g(x).
g(x) = x^3 – x^2 – 4x + 4
g(x) = x^3 + 2x^2 – 9x – 18
g(x) = x^3 – 3x^2 – 4x + 12
g(x) = x^3 + 2x^2 – 25x – 50
g(x) = 2x^3 + 14x^2 – 2x – 14

3)Provide a rough sketch of g(x). Label or identify the key features on the graph.

4)Esmeralda is graphing a polynomial function as a parabola. Before she begins graphing it, explain how to find the vertex. Make sure you include how to determine if it will be a maximum or minimum point. Use an example quadratic function to help you explain and provide its graph.

5)Heinz boasts that he can predict the degree of a polynomial function just by looking at the end behavior. Can Heinz do this? Explain.
Heinz is correct because the function does cross the x-axis 3 times but he didnt include the y-axis, therefore Esmeralda is also correct because the third degree function does cross the y-axis once which makes it possible for the third degree polynomial to have four intercepts.
the other key features of g(X) is the axis symmetry, The y-intercept, end of behavior, the vertex.
-This is an odd degree function with a positive leading coefficient.
-the left end will continue down
-the right end will continue up
-the zero's are (-3,0)(-2,0)(3,0)
-the y-intercept is (0,-18)
You have to find the axis of symmetry which is x=-b/2a
an example would be
2x^2-4x+3
a=2 b=-4
x=-(-4)/2(2)
x=4/4
x=1
the parabola opens up which means the vertex is the minimum point.
you cn only tell from this whetherthe function is even or odd, so no he cant
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