Definition and Domain of a Rational Expression

This Definition and Domain of a Rational Expression video also includes:

If a rational expression is composed of polynomial expressions, then why isn't the domain all real numbers? A concept video demonstrates the definition of a rational expression and the domain of a rational expression. Four problem videos cover examples simplifying a rational expression and determining its domain.

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Instructional Ideas

  • Use the video to introduce rational expressions
Classroom Considerations

  • Video uses symbolic notation for the set of real numbers; be sure learners can recognize the notation
  • Video assumes individuals have a good grasp of factoring techniques
Pros

  • Examples include denominators with both linear and quadratic expressions
  • Process is shown in a step-by-step fashion
Cons

  • The videos do not make use of the term undefined, which is generally used in these cases