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What is the range of the function \(f(x)=x^3\)?

Answer and explanation

Correct answer: \(( -\infty,\infty)\)

For every real number \(y\), \(x=\sqrt[3]{y}\) is real and gives \(f(x)=x^3=y\). Hence, \(x^3\) can produce every real value, so its range is \(( -\infty,\infty)\). Option A excludes negative values, while option C excludes positive values. Exam tip: an odd-power function such as \(x^3\) has all real numbers as its range.

Related tags

Relations And FunctionsReal Valued FunctionsDomain And RangeCubic FunctionRange Of FunctionTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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