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Adding and Subtracting Rational Functions

To add or subtract rational functions, we use the same techniques used to add or subtract rational expressions. Specifically, to find R(x)=f(x)+g(x)R(x) = f(x) + g(x) or R(x)=f(x)g(x)R(x) = f(x) - g(x) for rational functions f(x)f(x) and g(x)g(x), substitute the given rational expressions for each function, find the least common denominator (LCD) if the denominators are unlike, rewrite each expression as an equivalent rational expression with the LCD, write them as a single rational expression, and simplify the result by factoring and removing any common polynomial factors.

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Updated 2026-05-26

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Ch.7 Rational Expressions and Functions - Intermediate Algebra @ OpenStax

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