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Definition

Simplified Radical Expression

A radical expression, an\sqrt[n]{a}, is considered simplified if the radicand aa has no factors of mnm^n, where mm is any real integer or rational number and n2n \geq 2. In other words, to ensure a radical expression is fully simplified, one must examine the radicand for any factors that are perfect powers of the index nn. For example, 5\sqrt{5} is considered simplified because 55 contains no perfect square factors. However, 12\sqrt{12} is not simplified because 1212 has a perfect square factor of 44 (222^2). Similarly, 43\sqrt[3]{4} is simplified as it lacks perfect cube factors, whereas 243\sqrt[3]{24} is not simplified because 2424 contains the perfect cube factor of 88 (232^3). This definition establishes the standard for when a radical no longer requires extraction of factors.

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Updated 2026-05-01

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