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Which of the following functions has its range equal to the set of all real numbers?

Answer and explanation

Correct answer: \(f(x)=x^3\)

\(f(x)=x^3\) can produce every real value: for any \(y\in\mathbb{R}\), choose \(x=\sqrt[3]{y}\), giving \(f(x)=y\). In contrast, \(x^2\) and \(|x|\) never give negative outputs. Exam tip: an odd-power cubic with real domain has range \(\mathbb{R}\).

Related tags

Real Valued FunctionsDomain And RangeRange Of FunctionCubic FunctionClass 11 MathematicsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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