

5.5 Analyze Graphs of Polynomial Functions
Presentation
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Mathematics
•
10th Grade
•
Medium
Sean Sattler
Used 15+ times
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6 Slides • 7 Questions
1
5.5 Analyze Graphs of Polynomial Functions

2
Cubic Function (3rd degree Polynomial)
The degree of the polynomial tells you how many times the curve changes direction.
y=2x3−2x2−4x
Find x-intercepts by Factoring
3
Multiple Choice
What is the completely factored form?
2x3−2x2−4x
2x(x−2)(x+1)
2x(x2−x−2)
x2−x−2
(x−2)(x+1)
4
4th Degree Polynomial
Factor by Grouping
5
Multiple Choice
x4+2x3−x2−2x
What is the completely factored form?
(x3−x)(x+2)
x(x2−1)(x+2)
x(x+1)(x−1)(x+2)
x(x+1)(x−1)(x−2)
6
Multiple Choice
What is the degree of the polynomial function?
2
3
4
5
7
Multiple Choice
Which equation could be for the function in the diagram?
y=x4+2x3−3x2
y=x5
y=x2+2x
8
Multiple Choice
Which equation could be for the function in the diagram?
y=x3+2x2+1
y=x4+x3−2x2
y=x5−2x4
y=3x3+4
9
X-intercepts
You can write an equation for a polynomial function by identifying the x-intercepts, and writing the equation as a product of factors.
y=(x−1)(x+1)(x−2)
10
Write an equation for the graph by writing the x-intercepts as factors
y=x(x−1)(x−2)(x−3)
11
Multiple Choice
Which equation matches the graph?
y=(x+1)(x−2)
y=x(x+2)
y=(x+2)(x−1)
y=x2+3x+2
12
Multiple Choice
Which equation matches the graph?
y=(x−3)(x+2)(x−1)
y=(x−3)(x−2)(x−1)
y=(x+3)(x−2)(x+1)
y=x(x−1)(x+2)(x+3)
13
Summary
The Degree of a Polynomial tells us how many times the graph changes direction, and the maximum number of x-intercepts.
You can write x-intercepts as factors (i.e. if the graph has x-intercept at 5, this means the factor is (x-5).
In order to find x-intercepts, you must factor the polynomial, set it equal to zero, and solve for x.
Since most polynomials are not factorable, graphing calculators have features which allow you to find x-intercepts.
5.5 Analyze Graphs of Polynomial Functions

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