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Radical sign

The radical sign () describes a square root.

 


Explanation

To write a square root you can use different formats, such as

The solid stripe of the radical sign has the same meaning as the use of brackets.

 


Example 1

The calculation of 2√2 × 2√2 = 8 can be done as

2 × 2 × √2 × √2 = 4 × 2 = 8

because a radical sign is an implicit multiplication.

 


Additional information

The root sign probably originated after 1525 from the letter r (latin: radix for root).

 


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