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Which of the following real-valued functions has all real numbers as its domain but does not attain a minimum value?

Answer and explanation

Correct answer: \(f(x)=e^x\)

\(e^x\) is defined for every real \(x\) and is always positive. As \(x\to-\infty\), \(e^x\to0\), but it never equals 0, so no minimum is attained. In contrast, \(x^2\) and \(|x|\) attain 0. Exam tip: distinguish a limit from an attained value.

Related tags

Real Valued FunctionsDomain And RangeExponential FunctionMinimum ValueRelations And FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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