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Ch. 3 - Polynomial and Rational Functions
Blitzer - College Algebra 8th Edition
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Tutti i libri di testoBlitzer 8th EditionCh. 3 - Polynomial and Rational FunctionsProblema 17
Capitolo 4, Problema 17

Use the graph of the rational function in the figure shown to complete each statement in Exercises 15–20.

As x→−2+, f(x)→x\(\to\)-2^{+},\(\text{ }\)f(x)\(\to\) __

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Identify the vertical asymptote relevant to the limit as \(x \to -2^+\). From the graph, note the vertical asymptotes are at \(x = -16\) and \(x = -8\), so \(x = -2\) is not a vertical asymptote, but we need to observe the behavior of \(f(x)\) near \(x = -2\) from the right side.
Look closely at the graph near \(x = -2\) from the right side (values slightly greater than -2). Observe the value of \(f(x)\) as \(x\) approaches -2 from the right.
Determine whether \(f(x)\) is increasing or decreasing without bound, or approaching a finite value as \(x \to -2^+\). This will tell us if the function tends to \(+\infty\), \(-\infty\), or a finite number.
Based on the graph, note the trend of the function near $x = -2^+$. If the function approaches a horizontal asymptote or a specific value, that will be the limit.
Conclude the value of \(\lim_{x \to -2^+} f(x)\) by describing the behavior observed in the previous steps.

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Vertical Asymptotes

Vertical asymptotes occur where the function approaches infinity or negative infinity as x approaches a specific value. These are typically values that make the denominator of a rational function zero, causing the function to be undefined. The graph shows vertical asymptotes at x = -16 and y = 17, indicating behavior near these lines.
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Determining Vertical Asymptotes

Horizontal Asymptotes

Horizontal asymptotes describe the behavior of a function as x approaches positive or negative infinity. They represent a constant value that the function approaches but does not necessarily reach. In the graph, the horizontal asymptote is at x = -8, which is unusual since horizontal asymptotes are usually horizontal lines y = c, suggesting a possible labeling or interpretation detail.
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Determining Horizontal Asymptotes

Limit Behavior Near Asymptotes

Understanding the limit of a function as x approaches a value from the left or right is crucial for analyzing asymptotic behavior. For example, as x approaches -2 from the right (x → -2^+), the function's value may approach positive or negative infinity or a finite number. This concept helps predict the function's behavior near discontinuities or asymptotes.
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Introduction to Asymptotes
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