In mathematics, a square root of a number **a **is a number y such that **y ^{2} = a**, in other words, a number y whose square (the result of multiplying the number by itself, or

**y × y**) is a. For example,

**4 and −4**are square roots of

**16**because

**4**.

^{2}= (−4)^{2}= 16Every **non-negative real number** a has a unique non-negative square root, called the principal square root, which is denoted by √a, where √ is called the radical sign or radix. For example, the principal square root of 9 is 3, denoted √9 = 3, because 32 = 3 × 3 = 9 and 3 is non-negative. The term whose root is being considered is known as the **radicand**. The radicand is the number or expression underneath the radical sign, in this example 9.

The following video tutorial will guide you on how to execute square roots with real numbers in math: