Jan 13_Horizontal and vertical translation
.pdftranslations of polynomial functions
Handouts 7
Jan 13th 2014
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• Vertical & Horizontal translations |
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y f ( x) vs. |
y k f ( x) |
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Session 7 |
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y f ( x) vs. |
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f ( x h) |
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y f ( x) vs. y k f ( x h) |
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To develop understanding of the effects of vertical and horizontal |
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translations* on the original graphs of the functions and their related |
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equations |
y k f ( x) y f ( x h) |
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Sketch the graphs of |
and |
y k f ( x h) |
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for a given k and h values, given a sketch of the function y f ( x)
* A translation is a transformation on the graph of the function which slides each point of a figure the same distance in the same direction
y f ( x) vs. |
y k f ( x) or |
y f ( x) k |
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y x2 |
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y x2 3 |
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y x2 |
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3 y x2 3 |
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3
y f ( x) vs. y k f ( x) or y f ( x) k
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y x3 3 |
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y x3 |
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y x3 3 |
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y x3 3 |
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y x3 |
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y x3 |
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4
Vertical Translation
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x 3 |
y 3 x2 |
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y 3 |
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y x2 |
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y x 3 |
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y 3 x2 |
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y 3 |
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x
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Compared to the graph y f ( x), the graph of |
y k f ( x) results |
in a vertical translation of k units |
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If k 0, the graph moves up. If k 0, the graph moves down.
Determine k for the following graphs and write down the equations of the functions under the corresponding transformation
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k 3 |
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k 2 |
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y 3 x |
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y 2 x |
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f ( x) |
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f ( x) |
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k 2 |
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y 4 x |
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f ( x) x |
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k 0.5 |
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f ( x) x4 |
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y 3 3 |
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f ( x) 3 |
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Describe the difference between the graphs
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y 0
y f ( x)
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Moves up |
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y 5
y 5 f ( x)
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Moves down |
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y 1
y 1 f ( x)
y f ( x) vs. y f ( x h)
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y x2 |
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y x 3 2 |
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y x 3 2 |
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y
y x 3 2 y x2
y x 3 2
-3 |
3 |
x |
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8
Horizontal Translation
y
y ( x 3)2
y x2
y ( x 3)2
-3 |
3 |
x |
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Compared to the graph y f ( x), the graph of y f ( x h) results in a horizontal translation of h units
If h 0, the graph moves right. If h 0, the graph moves left
y f ( x) vs. y f ( x h)
y
y ( x 3)3 |
y x3 |
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y ( x 3) |
3 |
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-3 |
3 |
x |
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10