The square root can be indicated by a check mark.
√49 = 7, -7
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It is a keyboard, not a keybored ! There is no square root button on a standard keyboard, but if you are bored, you can find out how to program a key and get one of the keys to be your square root key.
It would be the square root key. (√) `it is not on the keyboard
Nothing!
On some calculators, you type the number, followed by the square-root key. On others, especially the more modern ones, you press the square root key, followed by the number, then you press the "equal" key to get the result.
As an example, the square root of 49 is 7. It's this because the square root of a number is another number multiplied by itself(7X7=49).