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alt 251 on the keypad
There is no single square root button on a keyboard. You can sometimes get the square root symbol by holding down alt and pressing 2 then 5 then 1 (or alt + 251). If that doesn't work, you could copy and paste it. √ (that square root sign is from pressing alt + 251)
To type the square root symbol on ypur keyboard press and hold alt and type 251.
You can use an equation editor or you can use alt codes. Alt 251 and you should get: √ or 221A and then Alt-X.
The principal square root is the non-negative square root.