It seems like they're teaching kids this theorem younger and younger, sometimes before students even learn how to solve an equation. So in this video I take this thing from the very basics. Word to the wise: Pythagorean Theorem only works on right triangles!
Simplifying Roots & Radicals
This video starts things off on the right foot with square roots, demonstrating the easiest and hardest-to-mess-up method for simplifying radicals, which is where we try and get the smallest number under the root as possible.
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)