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Square root and cube root of mathematics in the second volume of the first day of junior high school
The square root is also called quadratic square root, which is expressed as √ ~ The square root that belongs to non-negative number is called arithmetic square root. Positive numbers have two real square roots in opposite directions; 0 has only one square root, which is 0 itself; The square root of a pure imaginary number with two yokes.

Generally speaking, "√ ~" is only used to represent the arithmetic square root, that is, a non-negative square root. For example, the mathematical language is √ ~ 16 = 4. The language description is: under the root sign 16=4.

If the cube of a number is equal to A, then this number is called the cube root of A, which means that if X? =a, then x is called the cube root of a.

Warm reminder that the root index 2 in the square root can be omitted, but the root index 3 in the cube root cannot be omitted.