👉 The term "radical" is used in mathematics to denote any number that can be expressed as a solution of an equation or expression. This includes both positive and negative numbers, fractions, decimals, etc. The symbol for the root of a number is often denoted by a superscript 1, such as x^2. For example, when we say "sqrt(4)", it means that we are looking at the square root of 4 which is 2 because 2 squared equals