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Graphs of rational functions

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Grade 12 Advanced Functions, University Preparation (MHF4U)
C. Polynomial and Rational Functions
36. 12AF.C2.2
36.2 Graphs of rational functions

Graphs of Rational Functions

See how to graph rational functions by finding vertical, horizontal, and slant asymptotes, spotting holes, and reading end behavior.


What You'll Learn

A rational function graph is shaped by its vertical asymptotes, horizontal or slant asymptotes, and any holes left over from cancelled factors.
Vertical asymptotes come from denominator zeros that do not cancel, while holes come from factors that cancel completely.
Comparing the degrees of the numerator and denominator tells you whether the graph has a horizontal asymptote, a slant asymptote, or neither.
Plotting a few intercepts alongside the asymptotes is usually enough to sketch an accurate graph by hand.
The basic reciprocal function y equals 1 over x is the simplest rational graph and a good starting model for the rest.

What You'll Practice

1

Finding vertical and horizontal asymptotes for various rational functions

2

Factoring polynomials to identify points of discontinuity

3

Using synthetic and long division to determine slant asymptote equations

4

Plotting rational functions by combining asymptotes with intercepts and test points

Why This Matters

Graphing rational functions is essential for modeling real-world phenomena like rates, concentrations, and optimization problems. Mastering asymptotes helps you predict function behavior at extreme values and understand limits, which is foundational for calculus and advanced mathematics.

This Unit Includes

14 Video lessons
Practice exercises
Learning resources

Skills

Rational Functions
Vertical Asymptotes
Horizontal Asymptotes
Slant Asymptotes
Discontinuity
Factoring
Graphing
Polynomial Division
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