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

Answer and explanation

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

The radicand must be non-negative for a real value, so \(x+2\ge 0\). However, the square root is in the denominator and cannot be zero; therefore, \(x+2>0\), or \(x>-2\). Hence the domain is \((-2,\infty)\). Option A is incorrect because it includes \(x=-2\), which makes the denominator zero. Exam tip: when a square root occurs in the denominator, its radicand must be strictly positive.

Related tags

DomainReal-Valued FunctionsSquare-Root FunctionsInterval NotationReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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