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What is a rational function?

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Chapter 3.1

What is a rational function?


What You'll Learn

Define rational functions as ratios of polynomials
Identify non-permissible values where denominators equal zero
Recognize vertical asymptotes at non-permissible values
Determine horizontal asymptotes by analyzing end behavior
Construct graphs using tables of values and asymptote analysis
Interpret how curves approach asymptotes without touching them

What You'll Practice

1

Creating tables of values to plot rational function graphs

2

Finding non-permissible values from denominator restrictions

3

Identifying vertical and horizontal asymptotes from functions

4

Analyzing left-hand and right-hand behavior as x approaches infinity

Why This Matters

Rational functions appear everywhere in advanced math and real applications, from rates and ratios to physics formulas. Understanding asymptotes and non-permissible values is essential for calculus, where you'll analyze limits and continuity of complex functions.

This Unit Includes

1 Video lesson

Skills

Rational Functions
Asymptotes
Non-permissible Values
Polynomials
Graphing
End Behavior
Domain Restrictions
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