Math Problem Statement
Question 2(Multiple Choice Worth 3 points) (Rational Functions' Vertical Asymptotes and Holes MC)
The rational function r is defined as r of x equals the fraction with numerator x squared minus 5 x minus 14 and denominator x squared plus 9 x plus 14. Which of the following statements describes the behavior of r ?
The graph of r has an intercept at x = 2. The graph of r has a hole at x = –7 and a vertical asymptote at x = –2. The graph of r has a hole at x = –2 and a vertical asymptote at x = –7. The graph of r has zeros at x = 2 and x = 7 because r (2) = r (7) = 0.
Solution
To analyze the rational function , we need to identify its zeros, holes, and vertical asymptotes.
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Finding Zeros: The zeros of the function occur when the numerator is zero: Factoring gives: So, and are the zeros.
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Finding Holes and Vertical Asymptotes: We look for values that make the denominator zero: Factoring gives: So, the denominator is zero at and .
Since is also a zero of the numerator, there is a hole at . The remaining factor in the denominator creates a vertical asymptote at .
Summary:
- Zeros: and
- Hole:
- Vertical Asymptote:
Conclusion:
The correct statement is: The graph of r has a hole at and a vertical asymptote at .
Would you like further details or explanations on this? Here are some questions for consideration:
- How do you find holes in rational functions?
- What is the significance of vertical asymptotes?
- Can you explain the difference between a zero and a hole?
- How do you graph rational functions with holes and asymptotes?
- What happens to the function's value as it approaches the asymptote?
Tip: Always factor both the numerator and denominator to clearly identify zeros, holes, and vertical asymptotes.
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Math Problem Analysis
Mathematical Concepts
Rational Functions
Asymptotes
Zeros
Formulas
Factoring quadratic equations
Theorems
Identifying holes and vertical asymptotes in rational functions
Suitable Grade Level
Grades 9-12
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