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Determining the Domain, Graph, and Range of the Radical Function f(x)=x3f(x) = -\sqrt[3]{x}

When evaluating the radical function f(x)=x3f(x) = -\sqrt[3]{x}, the odd index (33) indicates that there are no restrictions on the radicand; it can be any real number. Consequently, the domain consists of all real numbers, expressed in interval notation as (,)(-\infty, \infty). To construct its graph, choose perfect cube xx-values (such as 8-8, 1-1, 00, 11, and 88) to simplify calculations. Taking the cube root and applying the leading negative sign results in the yy-values 22, 11, 00, 1-1, and 2-2. Plotting these ordered pairs produces a curve that is a vertical reflection of the standard cube root graph. Because the curve extends infinitely both upward and downward, the graph confirms that the range is also all real numbers, or (,)(-\infty, \infty).

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Updated 2026-05-26

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