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Which of the following functions is defined and gives a real value for every real number \(x\)?

Answer and explanation

Correct answer: \(f(x)=\sqrt{x^2+1}\)

Since \(x^2\ge 0\), we have \(x^2+1>0\) for every real \(x\), so its square root is always real. In option B, the radicand becomes negative when \(|x|>1\). Exam tip: for square-root functions, check that the radicand is always \(\ge0\).

Related tags

Real Valued FunctionsDomainRangeSquare Root FunctionsClass 11 MathematicsRelations And FunctionsTheir Domain And RangeReal Valued Functions Their Domain And Range

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