## Square root

### The square root of a number is a mathematical operation that determines what number, when multiplied by itself, equals the given number

The square root of a number is a mathematical operation that determines what number, when multiplied by itself, equals the given number. Symbolically, the square root of a number “x” is represented by the symbol √x.

For example, the square root of 9 (√9) is 3 because when 3 is multiplied by itself, it equals 9. Similarly, the square root of 25 (√25) is 5 because 5 multiplied by itself gives 25.

In algebraic terms, if “a” is a non-negative number, then the square root of “a” can be expressed as follows:

√a = b

Where “b” is a non-negative number such that b multiplied by itself equals “a”. It’s important to note that the square root can have two possible values, a positive and a negative value, when solving equations or when dealing with quadratic equations.

The concept of square roots is closely related to the concept of squares. A square is the result of multiplying a number by itself. For example, 3 squared (3²) is equal to 9 because 3 multiplied by itself equals 9.

The square root has various applications in mathematics, physics, engineering, and other fields. It is used in solving quadratic equations, calculating distances, areas, and volumes, and in some statistical calculations, among others.

When dealing with square roots, it’s important to remember that the square root of a negative number is not a real number. Instead, it is represented by the imaginary unit “i”. For example, the square root of -9 (√-9) is 3i, where “i” is the imaginary unit, and 3 multiplied by the imaginary unit “i” gives -9.

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