## square root function

### f(x) = /X̅

A square root function is a mathematical function that gives the square root of a number. The square root of a number is a value that, when multiplied by itself, gives the original number.

The square root function, denoted as √x or sqrt(x), takes a non-negative number as its input and returns the positive square root of that number. For example, the square root of 9 is 3 (√9 = 3) because 3 multiplied by itself equals 9.

The square root function can also be represented using an equation: y = √x or y = sqrt(x). In this equation, x represents the input value, and y represents the output or the value of the square root function.

It is important to note that the square root function is also defined for complex numbers. In this case, the square root of a complex number is complex as well. For instance, the square root of -1 is denoted as √(-1) or i, where i is the imaginary unit.

When graphed, the square root function forms a curve known as the square root curve or the radical curve. The graph of the square root function starts at the origin (0,0) and extends to positive values along the y-axis as x increases. The curve is always non-negative, meaning it lies above or on the x-axis.

Understanding the square root function is crucial in various areas of math, such as algebra, calculus, and geometry. It is commonly used to solve equations involving quadratic functions and to find the length of the sides of right triangles.

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