Kvadraattijuuria

Kvadraattijuuria refers to the mathematical operation of finding the square root of a number. The square root of a number x is a value y such that y multiplied by itself equals x. This is often denoted by the radical symbol √. For example, the square root of 9 is 3, because 3 * 3 = 9. Every positive real number has two square roots, a positive one and a negative one. For instance, both 3 and -3, when squared, result in 9. However, the symbol √ usually refers to the principal, or non-negative, square root.

In mathematics, the concept of a square root is fundamental and appears in various fields, including algebra, geometry, and calculus. It is the inverse operation of squaring a number. For non-negative real numbers, the square root is always a real number. For negative real numbers, their square roots are imaginary numbers, involving the imaginary unit 'i', where i² = -1. For example, the square root of -4 is 2i. Understanding kvadraattijuuria is essential for solving quadratic equations and many other mathematical problems.