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Standard 44: Domains of Rational Expressions

Standard 44: Domains of Rational Expressions. By: Abbie, Abby, Harley, Cole. Undefined Rational Expressions. A rational expression is undefined when the denominator is equal to zero The numerator can equal zero. Example #1.

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Standard 44: Domains of Rational Expressions

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  1. Standard 44: Domains of Rational Expressions By: Abbie, Abby, Harley, Cole

  2. Undefined Rational Expressions • A rational expression is undefined when the denominator is equal to zero • The numerator can equal zero

  3. Example #1 • Step 1: To find which numbers make the fraction undefined, create an equation where the denominator is not equal to zero. • Step 2: Solve the equation found in step 1. In this case, subtract 4 from each side. • Step 3: Write your answer using interval notation. In this case, since x ≠ –4 we get:

  4. Example #2 • Step 1: To find which numbers make the fraction undefined, create an equation where the denominator is not equal to zero. • Step 2: Solve the equation found in step 1. In this case, we need to factor the problem. • Step 3: Write your answer using interval notation. In this case, since x ≠ –2 and x ≠ 7 we get

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