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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 Also, if you like my videos you might like my books, featuring Professor Astro Cat. Professor Astro Cat Links: Frontiers of Space: http://nobrow.net/shop/professor-astr... Atomic Adventure: http://nobrow.net/shop/professor-astr... Intergalactic Activity Book: http://nobrow.net/shop/professor-astr... Solar System App: http://www.minilabstudios.com/apps/pr... Find me on twitter, instagram, and my website: http://dominicwalliman.com / dominicwalliman / dominicwalliman / dominicwalliman