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.
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