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.

Concepts

rational expressions, simplify rational expressions, linear equations, quadratic equations, rational equations

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Additional Tags

math

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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

HSA-APR.D.7