Concept explainers
To determine the transformation that reflects f(x) about the x -axis and then shrinking the resultant function by a factor of 12 , horizontally.
The transformation that reflects f(x) about the x -axis and then shrinking the resultant function horizontally by a factor of 12 :
y=−f(2x)
Concepts Used:
Given a function y=f(x) .
Horizontal shrink of a function:
The transformation y=f(ax) shrinks y=f(x) horizontally by a factor of 1a when a>1 .
Reflection of a function across the x-axis:
The transformation y=−f(x) reflects y=f(x) about the x -axis.
Finding the transformation:
Observe that the transformation y=−f(x) reflects y=f(x) about the x -axis.
Now, observe that the transformation y=−f(2x) shrinks y=−f(x) horizontally by a factor of 12 .
Thus, the resultant transformation is y=−f(2x) .
Conclusion:
The transformation that reflects f(x) about the x -axis and then shrinking the resultant function horizontally by a factor of 12 :
y=−f(2x)
Chapter 1 Solutions
PRECALCULUS:GRAPHICAL,...-W/ACCESS
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