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Transformations of functions: Horizontal stretches

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Chapter 23.5

Transformations of functions: Horizontal stretches


What You'll Learn

Identify how multiplying x by a constant compresses graphs horizontally
Apply the counteraction principle to predict horizontal stretches and compressions
Calculate new coordinates by dividing or multiplying x-values by stretch factors
Recognize that horizontal transformations are relative to the y-axis
Locate invariant points that remain unchanged during horizontal stretches

What You'll Practice

1

Graphing f(2x) by compressing functions horizontally by factor of 1/2

2

Graphing f(x/3) by stretching functions horizontally by factor of 3

3

Plotting transformed coordinates from original points using stretch factors

4

Verifying transformations by comparing widths and distances from y-axis

Why This Matters

Horizontal stretches are essential for understanding function transformations in precalculus and calculus. You'll use this skill to model real-world scenarios like sound waves, signal processing, and periodic functions, where compression and expansion represent changes in frequency and time scales.

This Unit Includes

2 Video lessons

Skills

Horizontal Stretch
Function Transformations
Compression
Coordinate Mapping
Counteraction Principle
Invariant Points
Graphing
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