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What is the domain of the function \(f(x)=\frac{x+1}{\sqrt{x^2-4}}\)?

Answer and explanation

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

Since \(\sqrt{x^2-4}\) is in the denominator, its radicand must be non-negative and the denominator must also be nonzero. Hence, \(x^2-4>0\), so \(x^2>4\), giving \(x<-2\) or \(x>2\). Therefore, the domain is \((-\infty,-2)\cup(2,\infty)\). Option B is incorrect because it includes \(x=\pm2\), where the denominator becomes zero. Exam tip: when a square root occurs in the denominator, require the expression under the root to be strictly positive.

Related tags

Real-Valued-FunctionsDomainRadical-FunctionsFunctionsInequalitiesReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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