The square root of a number is a value that, when multiplied by itself, gives the original number. It plays an essential role in mathematics, physics, engineering, and other fields that require ...

The square root of a number a is a number x such that x2 = a, or in other words, the number x whose squared value = a. For example, 2 and −2 are square roots of 2 because 2² = (−2)² = 4. The radical ...