Calculus: Find Formula for Rational Function w/ Asymptotes & x-intercept

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Homework Help Overview

The discussion revolves around finding a formula for a rational function characterized by specific asymptotic behavior and an x-intercept. The function is required to have a horizontal asymptote at y = -8/3, vertical asymptotes at x = -2 and x = 4, and an x-intercept exclusively at x = -5.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants explore the definitions of horizontal and vertical asymptotes, with one suggesting a potential function form. There is a debate regarding whether the proposed function meets the criteria of having only one x-intercept at x = -5.

Discussion Status

The discussion is ongoing, with participants examining the validity of a suggested function and questioning its compliance with the specified conditions. There is no clear consensus yet, as participants are still evaluating the implications of the function's behavior.

Contextual Notes

Participants are working under the constraints of the problem's requirements, specifically focusing on the unique x-intercept and the defined asymptotic behavior. There is an emphasis on ensuring that the function adheres strictly to these conditions.

Wierddemon
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I can't figure this question out, anyone have any ideas?

"Find a formula for a rational function whose horizontal asymptote is y = -8/3 and vertical asymptotes at x = -2 and x = 4 and whose ONLY x-intercept is at x = -5."
 
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What is a horizontal asymptote? It is defined as a line y = L such that:

\lim_{x\rightarrow \infty} f(x) = L or
\lim_{x\rightarrow -\infty} f(x) = L.

A vertical asymptote is defined as a line x=a such that \lim_{x\rightarrow a} f(x) = \infty. (or -\infty).

So one function is f(x) = \frac{-8x^{2}+200}{3(x-4)(x+2)}
 
Last edited:
that isn't right because it never passes through x = -5
 
yes it does. graph it, and look at the value at x = -5.
 
oh yeah, you're right, but it also has an x value of 5 and the only x-intercept should be -5
 

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