Recognizing When a Rational Expression is Undefined

It only takes the denominator to be zero to make an expression undefined. A video resource makes the connection of undefined fractions to rational expressions. It points out that to determine when a rational expression is undefined, you just need to set the denominator to zero and solve. The examples using linear and simple quadratic denominators help cement the concept for learners.

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CCSS: Designed
Instructional Ideas

  • Have the class graph the functions defined by the expression to see what happens at the undefined spot
  • Provide additional problems so pupils can practice the concept
Classroom Considerations

  • The class should be familiar with solving linear and quadratic equations
Pros

  • The video is specifically designed for the Common Core standard
  • The presenter takes a look at the concept in two different ways
Cons

  • None
Common Core