Rational Expressions

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Define Rational Expression.

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A rational expression is a fraction where the numerator and the denominator are both polynomials.

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CCSS.HSA.APR.D.7

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What is the domain of a rational expression?

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The domain of a rational expression is all real numbers except those that make the denominator equal to zero.

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CCSS.HSA.APR.D.6

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2 and -5

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0 and 3

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CCSS.HSF-IF.C.7D

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What is the first step in simplifying a rational expression?

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Factor both the numerator and the denominator.

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CCSS.HSA.APR.D.6

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What does it mean to exclude values in rational expressions?

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Excluding values means identifying and removing values that make the denominator zero, as division by zero is undefined.

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CCSS.HSA.APR.D.7

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What is the result of multiplying two rational expressions?

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To multiply two rational expressions, multiply the numerators together and the denominators together.

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CCSS.HSA.APR.D.7