1. Root sign method: factorization. Convert a number into the product of a square and a number.

2. For example:

12=2×2×3=2 ×3, √12 = √ (the square of 2) × √ 3 = 2 √ 3;

8=2×2×2=2 squared ×2, and √8=√(2 squared) × √ 2 = 2 √ 2;

6=2×3, there is no square, so you can't open the root sign;

18 = 3× 3× 2 = 3× 2, √ 18=√(3 squared) ×√2=3√2.

Extended data:

The root sign is a mathematical symbol. The root sign is a symbol used to represent the root operation of a number or an algebra. If a? =b, then a is the n-th root of b or a is the 1/n power of b.

Refers to the operation of finding the square root of a number, which is the inverse operation of a power. The n-th root of the number A (n is a natural number) refers to the number whose power n is equal to A, that is, the number B whose power n is equal to A. ..

References:

Baidu encyclopedia-root number

Baidu encyclopedia-prescription