Table of contents
- 0. Review of Algebra4h 18m
- 1. Equations & Inequalities3h 18m
- 2. Graphs of Equations1h 43m
- 3. Functions2h 17m
- 4. Polynomial Functions1h 44m
- 5. Rational Functions1h 23m
- 6. Exponential & Logarithmic Functions2h 28m
- 7. Systems of Equations & Matrices4h 5m
- 8. Conic Sections2h 23m
- 9. Sequences, Series, & Induction1h 22m
- 10. Combinatorics & Probability1h 45m
5. Rational Functions
Asymptotes
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Find all vertical asymptotes and holes of each function.
f(x)=2x3−x2−6xx2−2x
A
Hole(s): None, Vertical Asymptote(s): x=0,x=2,x=−23
B
Hole(s): x=0, Vertical Asymptote(s): x=−23
C
Hole(s): x=0, x=2, Vertical Asymptote(s): x=−23
D
Hole(s): x=0, x=2, Vertical Asymptote(s): x=23

1
Start by factoring the numerator and the denominator of the function f(x) = \frac{x^2 - 2x}{2x^3 - x^2 - 6x}.
Factor the numerator: x^2 - 2x can be factored as x(x - 2).
Factor the denominator: 2x^3 - x^2 - 6x can be factored by first taking out the common factor x, giving x(2x^2 - x - 6). Then, factor the quadratic 2x^2 - x - 6 further.
Identify the common factors between the numerator and the denominator. These common factors will indicate the location of holes in the graph of the function.
Determine the values of x that make the denominator zero but are not canceled by the numerator. These values are the vertical asymptotes of the function.
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Related Practice
Open Question
In Exercises 89–94, the equation for f is given by the simplified expression that results after performing the indicated operation. Write the equation for f and then graph the function. (1 − 3/(x+2)) / (1 + 1/(x−2))