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If the domain of the function \(f(x)=\frac{1}{x^2-a}\) is \(\mathbb{R}\setminus\{-3,3\}\), what is the value of \(a\)?

Answer and explanation

Correct answer: \(9\)

A rational function is undefined wherever its denominator is zero. Here, \(x^2-a=0\), so \(x^2=a\). The excluded values are \(x=-3\) and \(x=3\); hence \(a=(-3)^2=3^2=9\). Therefore, the correct answer is \(9\). Exam tip: Set the denominator equal to zero to identify the values excluded from the domain.

Related tags

Real-Valued-FunctionsDomain-Of-A-FunctionRational-FunctionsQuadratic-EquationsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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