Copyright © 2011 Pearson, Inc. 1.6 Graphical Transformations.

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Presentation transcript:

Copyright © 2011 Pearson, Inc. 1.6 Graphical Transformations

Copyright © 2011 Pearson, Inc. Slide What you’ll learn about Transformations Vertical and Horizontal Translations Reflections Across Axes Vertical and Horizontal Stretches and Shrinks Combining Transformations … and why Studying transformations will help you to understand the relationships between graphs that have similarities but are not the same.

Copyright © 2011 Pearson, Inc. Slide Transformations In this section we relate graphs using transformations, which are functions that map real numbers to real numbers. Rigid transformations, which leave the size and shape of a graph unchanged, include horizontal translations, vertical translations, reflections, or any combination of these. Nonrigid transformations, which generally distort the shape of a graph, include horizontal or vertical stretches and shrinks.

Copyright © 2011 Pearson, Inc. Slide Vertical and Horizontal Translations Let c be a positive real number. Then the following transformations result in translations of the graph of y = f(x). Horizontal Translations y = f(x – c) a translation to the right by c units y = f(x + c) a translation to the left by c units Vertical Translations y = f(x) + c a translation up by c units y = f(x) – c a translation down by c units

Copyright © 2011 Pearson, Inc. Slide Example Vertical Translations

Copyright © 2011 Pearson, Inc. Slide Solution

Copyright © 2011 Pearson, Inc. Slide Example Finding Equations for Translations

Copyright © 2011 Pearson, Inc. Slide Solution

Copyright © 2011 Pearson, Inc. Slide Reflections The following transformations result in reflections of the graph of y = f(x): Across the x-axis y = –f(x) Across the y-axis y = f(–x)

Copyright © 2011 Pearson, Inc. Slide Graphing Absolute Value Compositions Given the graph of y = f(x), the graph y = |f(x)| can be obtained by reflecting the portion of the graph below the x-axis across the x-axis, leaving the portion above the x-axis unchanged; the graph of y = f(|x|) can be obtained by replacing the portion of the graph to the left of the y-axis by a reflection of the portion to the right of the y-axis across the y-axis, leaving the portion to the right of the y-axis unchanged. (The result will show even symmetry.)

Copyright © 2011 Pearson, Inc. Slide Stretches and Shrinks

Copyright © 2011 Pearson, Inc. Slide Example Finding Equations for Stretches and Shrinks

Copyright © 2011 Pearson, Inc. Slide Solution

Copyright © 2011 Pearson, Inc. Slide Example Combining Transformations in Order

Copyright © 2011 Pearson, Inc. Slide Solution

Copyright © 2011 Pearson, Inc. Slide Example Combining Transformations in Order

Copyright © 2011 Pearson, Inc. Slide Solution

Copyright © 2011 Pearson, Inc. Slide Solution (continued)

Copyright © 2011 Pearson, Inc. Slide Quick Review

Copyright © 2011 Pearson, Inc. Slide Quick Review Solutions