Define the term 'radical' in mathematics.

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In mathematics, the term 'radical' refers to a root of a number or expression. The most common type of radical is the square root, denoted by the radical symbol $$ \sqrt{} $$. For example, $$ \sqrt{4} = 2 $$ because $$ 2^2 = 4 $$.

Radicals can also represent higher roots, such as cube roots, fourth roots, etc. The general form of a radical expression is:

$$
\sqrt[n]{a}
$$

where $$ n $$ is the degree of the root (e.g., $$ n = 2 $$ for square roots, $$ n = 3 $$ for cube roots) and $$ a $$ is the radicand (the number or expression under the root).

Radicals can be simplified, added, subtracted, multiplied, and divided, following specific rules. They are often encountered in algebra, geometry, and calculus.
In mathematics, a 'radical' is a root of a number or expression, like the square root $$ \sqrt{4} = 2 $$. It can also be a cube root or higher roots.

Define the term 'radical' in mathematics.

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