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Chapter 3: Problem 65

Is it possible for a rational function to have all three types of asymptotes (vertical, horizontal, and slant)? Why or why not?

Short Answer

Expert verified
No, a rational function cannot have all three types of asymptotes. There can be one or more vertical asymptotes, but a rational function can only have one type of infinite asymptote (horizontal or slant), not both.

Step by step solution

01

Understanding Rational Functions and Asymptotes

Rational functions are characterized by the ratio of two functions, usually in the form \( f(x) = \frac{p(x)}{q(x)} \). Asymptotes refer to a line that the graph approaches as the values approach positive or negative infinity. Vertical asymptotes occur when the denominator of a rational function equals zero as \( x \to a \). Horizontal asymptotes are lines \( y = b \) that the y-values of the function approach. Slant (or oblique) asymptotes occur when the degree of the polynomial in the numerator is one more than the degree of the polynomial in the denominator. A single rational function can have one horizontal or slant asymptote, but not both.
02

Rational Function Limitations

A rational function has only one horizontal or slant asymptote because these occur as \(x \to \pm \infty\), meaning as \(x\) runs towards positive or negative infinity. In both cases, the behavior of the function as \(x\) goes towards infinity is being described. For a single function, as \(x\) heads towards infinity or negative infinity, it can approach only one value, so it cannot cross over to approach a different line at some point and thus can only have one horizontal or slant asymptote.
03

Final Conclusion

Given the properties of rational functions, it's impossible for a rational function to have all three types of asymptotes - vertical, horizontal, and slant. Vertical asymptotes can exist with either a horizontal or a slant asymptote, but not both since horizontal and slant asymptotes describe the function's behavior as \(x\) approaches infinity; thus, it can't approach two different values.

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Most popular questions from this chapter

Write the function in the form \(f(x)=(x-k) q(x)+r\) for the given value of \(k\), and demonstrate that \(f(k)=r\). $$f(x)=2 x^{3}+x^{2}-14 x-10, \quad k=1+\sqrt{3}$$

Use the graph of \(y=x^{3}\) to sketch the graph of the function. $$f(x)=(x+1)^{3}-4$$

Algebraic and Graphical Approaches In Exercises \(31-46\), find all real zeros of the function algebraically. Then use a graphing utility to confirm your results. $$h(t)=t^{2}+8 t+16$$

Analyzing a Graph In Exercises \(47-58\), analyze the graph of the function algebraically and use the results to sketch the graph by hand. Then use a graphing utility to confirm your sketch. $$f(x)=1-x^{6}$$

Determine (a) the maximum number of turning points of the graph of the function and (b) the maximum number of real zeros of the function. $$f(x)=x^{2}-4 x+1$$
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