## Radical

### In mathematics, a radical is a symbol (√) used to represent the principal square root of a number

In mathematics, a radical is a symbol (√) used to represent the principal square root of a number. The symbol itself is called a radical sign or a square root symbol. The principal square root of a number is the non-negative real number that, when multiplied by itself, gives the original number.

For instance, if we take the square root of 25, the radical sign (√) is placed in front of the number, and it can be written as √25. The square root of 25 is 5 because 5 multiplied by itself equals 25.

In addition to square roots, radicals can also represent other types of roots such as cube roots (∛), fourth roots (∜), and so on. The index or order of the root determines the number of times the base needs to be multiplied by itself to equal the radicand (the number inside the radical symbol).

For example, the cube root (∛) of 27 is written as ∛27. The cube root of 27 is 3 because 3 multiplied by itself three times (3 * 3 * 3) equals 27.

Radicals are commonly used in various mathematical topics such as algebra, geometry, calculus, and more. They play a significant role in solving equations, simplifying expressions, and dealing with irrational numbers.

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