Definition of Radical:

A radical is a mathematical symbol (√) that represents the square root of a number. It is used to indicate the principal square root of a nonnegative number or the positive and negative roots of a complex number.


In mathematics, radicals are commonly used when solving equations or simplifying expressions that involve square roots. They help in finding the value of an unknown variable or simplifying complex mathematical expressions.


Consider the equation x2 - 9 = 0. To solve for x, we can use radicals and rewrite the equation as x = ±√9. This implies that x could be either 3 or -3.