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Which of the following functions has a domain consisting only of positive real numbers?

Answer and explanation

Correct answer: \(f(x)=\frac{1}{\sqrt{x}}\)

For \(\frac{1}{\sqrt{x}}\), the square root requires \(x\ge 0\), but the denominator cannot be zero. Hence only \(x>0\) is allowed. In \(\sqrt{x}\), zero is included. Exam tip: check radical and denominator restrictions separately.

Related tags

Real Valued FunctionsDomain Of FunctionsSquare Root FunctionsRational FunctionsClass 11 MathematicsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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