pääkvadraattijuuri
Pääkvadraattijuuri, also known as the principal square root, refers to the non-negative square root of a number. When a number has two square roots, one positive and one negative, the principal square root is the positive one. For example, the number 9 has two square roots: 3 and -3. The principal square root of 9 is 3. This convention is widely adopted in mathematics to ensure a unique value for the square root operation.
The symbol for the principal square root is the radical sign, $\sqrt{}$. So, $\sqrt{9} = 3$. If the
In the context of real numbers, only non-negative numbers have real principal square roots. The principal square