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Method 1: Use the Definition of Vertical Asymptote The line x = a is called a Vertical Asymptote of the curve y = f(x) if at least one of the following statements is true. Method 2: For rational functions f(x) Step 1: Write f(x) in reduced form Step 2: if x – c is a factor in the denominator then x = c is the vertical asymptote.
