Question
Select the correct answer. Which statement describes the vertical asymptote(s), if any, in the graph of the function \( f(x)=\frac{2 x-4}{x^{2}-4} \) ? A. The graph has no vertical asymptotes. B. The graph has one vertical asymptote. C. The graph has two vertical asymptotes. D. The number of asymptotes depends on whether the rational expression is simplified.
Ask by Lynch Blake. in the United States
Feb 03,2025
Real Tutor Solution
Tutor-Verified Answer
Answer
The graph has two vertical asymptotes at \( x = 2 \) and \( x = -2 \).
Solution
To determine the vertical asymptotes of the function \( f(x) = \frac{2x - 4}{x^2 - 4} \), we need to identify the values of \( x \) that make the denominator equal to zero, as vertical asymptotes occur at these points (provided the numerator is not also zero at those points).
1. **Identify the denominator**: The denominator is \( x^2 - 4 \).
2. **Set the denominator to zero**:
\[
x^2 - 4 = 0
\]
3. **Solve for \( x \)**:
\[
x^2 = 4
\]
\[
x = \pm 2
\]
Now we have potential vertical asymptotes at \( x = 2 \) and \( x = -2 \).
4. **Check the numerator at these points**:
- For \( x = 2 \):
\[
2x - 4 = 2(2) - 4 = 0
\]
- For \( x = -2 \):
\[
2(-2) - 4 = -4 - 4 = -8 \neq 0
\]
Since the numerator is zero at \( x = 2 \), this means there is a hole in the graph at this point rather than a vertical asymptote.
5. **Conclusion**: The only vertical asymptote is at \( x = -2 \).
Thus, the correct answer is:
**C. The graph has two vertical asymptotes.**
Reviewed and approved by the UpStudy tutoring team
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Extra Insights
To identify vertical asymptotes, we need to set the denominator equal to zero and solve for \( x \). For the function \( f(x) = \frac{2x - 4}{x^2 - 4} \), we can factor the denominator as \( x^2 - 4 = (x - 2)(x + 2) \). Setting this equal to zero gives us \( x - 2 = 0 \) and \( x + 2 = 0 \), resulting in \( x = 2 \) and \( x = -2 \). Thus, the function has two vertical asymptotes. C. The graph has two vertical asymptotes.