## Square Root Function

### The square root function, denoted as √x, is a mathematical function that takes a non-negative real number x as input and returns the non-negative real number that, when multiplied by itself, equals x

The square root function, denoted as √x, is a mathematical function that takes a non-negative real number x as input and returns the non-negative real number that, when multiplied by itself, equals x. In other words, it calculates the principal square root of a number.

For example, if we have x = 4, the square root function (√4) returns 2 since 2 multiplied by itself equals 4. Similarly, (√9) would return 3 because 3 multiplied by itself equals 9.

The square root function can be graphically represented as a curve on a coordinate plane. The graph starts at the origin (0, 0) and increases as x increases. However, the graph is limited to the non-negative values of x since taking the square root of a negative number would involve imaginary numbers.

It is important to note that the square root function is the inverse of the squaring function. If we square a number and then take its square root, we will obtain the original number. Likewise, if we take the square root of a number and then square it, we will also obtain the original number. This property forms the basis for solving quadratic equations, as well as many other applications in mathematics and science.

Some key properties of the square root function include:

1. Non-negativity: The square root of a number is always non-negative. The square root of 4 is 2, not -2.

2. Positive numbers: The square root of a positive number is always positive. For example, the square root of 9 is 3, not -3.

3. Principal square root: When calculating the square root of a positive number, we usually refer to the positive root as the principal square root. For example, the principal square root of 16 is 4, not -4.

4. Square of a square root: The square of the square root of a number is equal to the original number. For example, (√4)^2 is equal to 4.

The square root function is widely used in various fields, such as engineering, physics, and finance, to solve problems involving areas, lengths, volumes, and other quantities that relate to squares or quadratic equations.

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