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Which real values are excluded from the domain of the function \(f(x)=\frac{5}{x^2-9}\)?

Answer and explanation

Correct answer: \(\{-3,3\}\)

The denominator of a rational function cannot be zero. Here, \(x^2-9=0\), so \(x^2=9\) and \(x=\pm3\). Therefore, \(-3\) and \(3\) are excluded from the domain. Option A incorrectly uses \(-9\) and \(9\); the denominator is not zero at those values. Exam tip: To find the domain of a rational function, set its denominator equal to zero and exclude the resulting values.

Related tags

DomainRational-FunctionsReal-Valued-FunctionsExcluded-ValuesRelations-And-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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