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Which of the following functions is defined for all real numbers and has only positive real numbers as its range?

Answer and explanation

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

\(2^x\) is defined for every real \(x\), and its value is always greater than 0; hence its range is \((0,\infty)\). In contrast, \(x^2\) also includes 0 in its range. Exam tip: an exponential function never attains 0.

Related tags

Real Valued FunctionsDomain And RangeExponential FunctionRelations And FunctionsClass 11 MathematicsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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