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Graphing reciprocals of quadratic functions

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Grade 12 Advanced Functions, University Preparation (MHF4U)
C. Polynomial and Rational Functions
35. 12AF.C2.1
35.2 Graphing reciprocals of quadratic functions

How to Graph the Reciprocal of a Quadratic Function

See how the zeros, vertex, and sign changes of a quadratic transform into vertical asymptotes and turning points on its reciprocal graph.


What You'll Learn

Identify the zeros of the quadratic denominator to locate every vertical asymptote on the graph.
Map the vertex of the quadratic to the corresponding maximum or minimum point on the reciprocal graph.
Analyze the sign of the quadratic in each interval to decide whether a branch lies above or below the x-axis.
Recognize the horizontal asymptote at y = 0 that every reciprocal quadratic graph shares.
Compare the two-root, repeated-root, and no-root cases to predict the overall shape before plotting.
Sketch smooth curved branches that hug each asymptote without ever touching or crossing it.

What You'll Practice

1

Plotting asymptotes and invariant points from quadratic functions

2

Finding reciprocal values of vertices, intercepts, and selected points

3

Graphing reciprocals of upward and downward-opening parabolas

4

Connecting points while tracing along horizontal and vertical asymptotes

Why This Matters

Graphing reciprocals of quadratic functions develops your understanding of function transformations and asymptotic behavior, skills essential for advanced algebra, calculus, and real-world modeling of inverse relationships like speed vs. time or electrical resistance.

This Unit Includes

4 Video lessons
Practice exercises
Learning resources

Skills

Reciprocal Functions
Quadratic Functions
Asymptotes
Invariant Points
Function Transformations
Graphing
Vertices
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