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

Answer and explanation

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

\(x^2+1\) is a polynomial, so it is defined and real for every real \(x\). In contrast, \(\sqrt{x-3}\) needs \(x\ge3\). Exam tip: first check restrictions from roots, denominators, and logarithms.

Related tags

Real Valued FunctionsDomain And RangePolynomial FunctionsSquare Root FunctionsLogarithmic FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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