Square root in mathematics: square root, also called quadratic square root. For non-negative real numbers, it refers to real numbers whose result of self-multiplication is equal to [√], in which the square root belonging to non-negative real numbers is called arithmetic square root. Positive numbers have two square roots; 0 has only one square root, which is 0 itself; Negative numbers have no square root. For example, the square root of 9 is 3 Note: Sometimes the square root we say refers to the arithmetic square root.

If the square of a number x equals a, that is, x? =a, then this number x is called the square root of a (also called quadratic root). In layman's terms, it is a number multiplied by itself, which equals another number. The original number is the square root of the multiplication number.