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Factoring is usually helpful in identifying zeros of denominators.

If there are not common factors in the numerator and the denominator, the lines x equal the zeros of the denominator are the vertical asymptotes for the graph of the rational function.

Example:

f(x) = x/(x^2 - 1)

f(x) = x/[(x + 1)(x - 1)]

x + 1 = 0 or x - 1 = 0

x = -1 or x = 1

Thus, the lines x = -1 and x = 1 are the vertical asymptotes of f.

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Q: How many vertical asymptotes can there be in a rational function?
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