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Rational Expression Concepts

Module by: Kenny M. Felder. E-mail the author

Summary: This module provides an introduction to rational expressions.

The term “rational” in math is not used in the sense of “sane” or “sensible.” It is instead used to imply a ratio, or fraction. A rational expression is the ratio of two polynomials: for instance, x2+1x2−1x2+1x2−1 size 12{ { {x rSup { size 8{2} } +1} over {x rSup { size 8{2} } - 1} } } {} is a rational expression.

There are two rules for working with rational expressions.

  1. Begin every problem by factoring everything you can.
  2. Remember that, despite all the complicated looking functions, a rational expression is just a fraction: you manipulate them using all the rules of fractions that you are familiar with.

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A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

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