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Determine the domain of the function \(f(x)=\frac{1}{\sqrt{4-x^2}}\).

Answer and explanation

Correct answer: \((-2,2)\)

Because the square root is in the denominator, its radicand must be strictly positive: \(4-x^2>0\). Thus \(x^2<4\), which gives \(-2<x<2\). Therefore, the domain is \((-2,2)\). Option B is incorrect because at \(x=\pm2\), the denominator becomes zero. Exam tip: when a square root appears in the denominator, impose the strict condition radicand \(>0\).

Related tags

Relations-FunctionsReal-Valued-FunctionsDomainRadicalsInequalitiesReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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