Question

why does this method of finding square roots work
https://www.youtube.com/watch?v=kGy3yBOwFfk

Answer 1

That's a good question! We used to use this method when I was in school (many years ago!).
I've never thought to ask that question! Maybe its based on the algebraic identity
(a + b)^2 = a^2 + 2ab +b^2.
I have to go now but i'll give it some thought and come back to you..

Answer 2

hmm... i don't understand it lol poor kids this is just bollocks