# Graph (x^2-3x-18)/(x^2-4)

Find where the expression is undefined.
Since as from the left and as from the right, then is a vertical asymptote.
Since as from the left and as from the right, then is a vertical asymptote.
List all of the vertical asymptotes:
Consider the rational function where is the degree of the numerator and is the degree of the denominator.
1. If , then the x-axis, , is the horizontal asymptote.
2. If , then the horizontal asymptote is the line .
3. If , then there is no horizontal asymptote (there is an oblique asymptote).
Find and .
Since , the horizontal asymptote is the line where and .
There is no oblique asymptote because the degree of the numerator is less than or equal to the degree of the denominator.
No Oblique Asymptotes
This is the set of all asymptotes.
Vertical Asymptotes:
Horizontal Asymptotes:
No Oblique Asymptotes
Graph (x^2-3x-18)/(x^2-4)

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