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Rationalizing Denominators with Cube Roots

To rationalize a denominator containing a cube root, multiply both the numerator and the denominator by an expression that completes the radicand into a perfect cube. For a denominator of the form a3\sqrt[3]{a}, multiply by a23\sqrt[3]{a^2} to obtain a33=a\sqrt[3]{a^3} = a. This ensures the radical is eliminated from the denominator, leaving a rational expression. Always simplify the radical in the denominator, if possible, before rationalizing to maintain smaller, more manageable numbers.

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Updated 2026-05-25

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Ch.8 Roots and Radicals - Intermediate Algebra @ OpenStax

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