Solve each problem. Work each of the following. Sketch the graph of a function that does not intersect its horizontal asymptote y=1, has the line x=3 as a vertical asymptote, and has x-intercepts (2, 0) and (4, 0).
Table of contents
- 0. Review of Algebra4h 18m
- 1. Equations & Inequalities3h 18m
- 2. Graphs of Equations1h 43m
- 3. Functions2h 17m
- 4. Polynomial Functions1h 44m
- 5. Rational Functions1h 23m
- 6. Exponential & Logarithmic Functions2h 28m
- 7. Systems of Equations & Matrices4h 5m
- 8. Conic Sections2h 23m
- 9. Sequences, Series, & Induction1h 22m
- 10. Combinatorics & Probability1h 45m
5. Rational Functions
Graphing Rational Functions
Problem 9
Textbook Question
Use the graph of the rational function in the figure shown to complete each statement in Exercises 9–14.

As x -> -3^-, f(x) -> __
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Identify the point of interest on the x-axis, which is x approaching -3 from the left (x → -3⁻).
Observe the behavior of the function f(x) as x approaches -3 from the left side on the graph.
Note whether the function values are increasing or decreasing and whether they approach a finite number or infinity.
From the graph, as x approaches -3 from the left, the function values approach 0 from below, indicating f(x) approaches 0⁻.
Conclude that as , .
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Vertical Asymptotes
Vertical asymptotes occur where the function approaches infinity or negative infinity as x approaches a specific value. They represent values of x that make the denominator zero in a rational function, causing the function to be undefined. In the graph, vertical asymptotes are shown at x = 6 and x = 14.
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Horizontal Asymptotes
A horizontal asymptote describes the behavior of a function as x approaches positive or negative infinity. It indicates the value that the function approaches but does not necessarily reach. In this graph, the horizontal asymptote is y = 0, meaning the function values get closer to zero as x becomes very large or very small.
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Determining Horizontal Asymptotes
Limits and One-Sided Limits
Limits describe the value a function approaches as the input approaches a certain point. One-sided limits consider the approach from only one side (left or right). The question asks for the limit of f(x) as x approaches -3 from the left, which involves analyzing the graph's behavior near x = -3 from values less than -3.
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