Step-by-step explanation:
"Square roots" redirects here. For other uses, see Square Roots (disambiguation).
Notation for the (principal) square root of x
For example, √25 = 5, since 25 = 5 ⋅ 5, or 52 (5 squared).
In mathematics, a square root of a number x is a number y such that y2 = x; in other words, a number y whose square (the result of multiplying the number by itself, or y ⋅ y) is x.[1] For example, 4 and −4 are square roots of 16, because 42 = (−4)2 = 16. Every nonnegative real number x has a unique nonnegative square root, called the principal square root, which is denoted by {\displaystyle {\sqrt {x}},}{\displaystyle {\sqrt {x}},}[2] where the symbol {\displaystyle {\sqrt {}}}{\sqrt {}} is called the radical sign[3] or radix. For example, the principal square root of 9 is 3, which is denoted by {\displaystyle {\sqrt {9}}=3,}{\displaystyle {\sqrt {9}}=3,} because 32 = 3 ⋅ 3 = 9 and 3 is nonnegative. The term (or number) whose square root is being considered is known as the radicand. The radicand is the number or expression underneath the radical sign, in this case 9
