7. Transformations of Polynomial Functions
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We will describe the graph of g as a transformation of the graph of f. Then we will write a rule for g. Finally, we will graph the functions.
To describe and graph the given transformation, g(x)=- f(x), let's look at the possible transformations. Then we can more clearly identify the ones being applied to the function f(x)=x^5-4x+6.
Reflections | |
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In the x-axis y=- f(x) | In the y-axis y=f(- x) |
g(x)=- f(x) We can describe the transformations as a reflection in the x-axis.
Let's make a table of values for both functions.
Input | f(x) | g(x) | ||
---|---|---|---|---|
x | x^5-4x+6 | f(x)=x^5-4x+6 | - x^5+4x-6 | g(x)=- x^5+4x-6 |
- 2 | ( - 2)^5-4( - 2)+6 | - 18 | - ( - 2)^5+4( - 2)-6 | 18 |
- 1 | ( - 1)^5-4( - 1)+6 | 9 | - ( - 1)^5+4( - 1)-6 | - 9 |
0 | 0^5-4 ( 0)+6 | 6 | - 0^4+4 ( 0)-6 | - 6 |
1 | 1^5-4 ( 1)+6 | 3 | - 1^5+4 ( 1)-6 | - 3 |
1.5 | 1.5^5-4 ( 1.5)+6 | 7.594 | - 1.5^5+4 ( 1.5)-6 | - 7.594 |
Finally, we plot the points of each function and connect them with smooth curves.