Why is it called a SQUARE root?

I explain why it is called a square root, and also how a square root works.

#mathematics #DoS

Clarifications:
To keep this video simple I decided to not talk about complex numbers. But perhaps I should have mentioned complex numbers when talking about the square root of negative numbers.

When I said "you can never have a square root of a negative number", I guess I could have said "you can never have a square root of a negative number, unless you use complex numbers."

Cool, well I'm still learning! And thanks for keeping me in check. :D

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