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College Algebra
In the context of radicals, the index specifies the root being taken. For example, in $\sqrt[n]{x}$, 'n' is the index and indicates an n-th root.
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An expression that includes a root symbol ($\sqrt{}$) with an indicated radicand.
An exponent that can be expressed as a fraction where $a^{m/n} = \sqrt[n]{a^m}$.
The number or expression inside a radical symbol that is subject to rooting.