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You should be able to easily find YouTube videos on most math topics you are interested in.

However it can definitely be worth while to have a lesson on newton's method so everything is in one place.

Wait until you see Sweeny-Robertson-Tocher division. I actually figured out how to do it without a look-up table—a 60-year-old problem everyone's been trying to solve, took me 2 hours, they were thinking about it wrong and the answer is trivially obvious.

It's basically Newton-Rhapson with negative digits.

It's a computer division algorithm that's fairly fast, problem being charging up the look-up table is slow, and you need to complete the q-digit lookup before you can start adding, multiplying, and inverting bits, so the entire lookup is in the critical path.  Calculating the digits arithmetically requires division, and is a long and ungodly slow operation.  It's a little tricky at first though yeah.

You're right, there are lots of videos explaining it ><, I just enjoy the Khan Academy way to introduce math topics.
Anyways, I owe you one.

:0 there are lots of unknown math information. Seems like are from Russian books Xdd