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20 13 seventh grade mathematics lesson 1 exercise volume 2 (PEP) square root answer
Square root, also called quadratic square root, is expressed as 〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓〓

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.