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Reflection across the y-axis: y = f(-x)

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Chapter 23.3

Reflection across the y-axis: y = f(-x)


What You'll Learn

Recognize that y = f(-x) creates a reflection across the y-axis
Apply the transformation by dividing all x-coordinates by negative one
Identify how positive x-values become negative x-values while y-values remain unchanged
Verify reflected graphs by substituting points into the transformed function

What You'll Practice

1

Reflecting graphs across the y-axis by transforming key points

2

Plotting reflected functions from original coordinate pairs

3

Drawing reflections of cubic and other functions using the mirror image concept

Why This Matters

Understanding reflections across the y-axis is essential for mastering function transformations, which you'll use extensively in precalculus and calculus. This skill helps you visualize symmetry, analyze even and odd functions, and solve real-world problems involving mirror images and symmetrical designs.

This Unit Includes

2 Video lessons
Learning resources

Skills

Reflections
Function Transformations
Y-axis Symmetry
Coordinate Manipulation
Graphing Functions
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