Négyzetgyök

Négyzetgyök is the Hungarian word for square root. In mathematics, the square root of a number x is a number y such that y squared equals x. This is written as y^2 = x. Every non-negative real number has a unique non-negative square root, called the principal square root. For example, the principal square root of 9 is 3 because 3^2 = 9. The symbol for the square root is √. So, √9 = 3.

Numbers that have an integer as their square root are called perfect squares. Examples include 1, 4, 9, 16, and 25. The square root of a negative number is not a real number. Instead, it is an imaginary number, involving the imaginary unit 'i', where i^2 = -1.

The concept of square roots is fundamental in algebra and geometry. It is used in solving quadratic equations, calculating distances in coordinate geometry (the Pythagorean theorem), and many other areas of mathematics and science. The process of finding the square root of a number is called extracting the square root.