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Example

Determining the Domain, Graph, and Range of the Radical Function f(x)=x23f(x) = \sqrt[3]{x - 2}

For the function f(x)=x23f(x) = \sqrt[3]{x - 2}, the radical features an odd index (33), meaning there are no mathematical restrictions placed on the radicand. The domain is therefore all real numbers, which is written as (,)(-\infty, \infty) in interval notation. The graph is best constructed by purposefully selecting xx-values that cause the radicand to become a perfect cube (such as 6-6, 11, 22, 33, and 1010). These inputs correspond to integer yy-values (2-2, 1-1, 00, 11, and 22). The plotted graph forms a continuous, S-shaped curve that shifts horizontally but continues indefinitely in both the vertical and horizontal directions, demonstrating that the range is also all real numbers, or (,)(-\infty, \infty).

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Updated 2026-05-25

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