To know how to open the square root, we must first understand the formula of the square root.

1, using the formula, we can know that the square of 2 is 2*2=4, so √4 is equal to 2 after root. It can also be seen that √9=3, √ 169= 13?

2. Square root = 1.4 14 (three decimal places are reserved). Can be calculated according to the calculation chart.

Extended data:

Double nonnegativity

If x=√a

So:

1, a≥0 (if less than 0, it is an imaginary number)

2、x≥0

Relationship with square root

A positive number has two square roots, which are opposite numbers, and a non-negative square root is the arithmetic square root of this number.

Negative numbers have no arithmetic square root.