Normally I pride myself on not deriving anything, since 99% of the time that infuriates students. However, in the case of the distance formula, I've found over my years of tutoring that showing how it came from the Pythagorean Formula is actually really helpful for students trying to memorize and use the formula. So I do that here. But if you hate it, you can always skip the first half of the video! Don't miss the word problem though.
Back to no proofs on this one! We'll just learn this simple formula, and use it on a couple of basic problems before embarking on an awesome word problem example where we'll find the midpoint between L.A. and New York, and even find the name of the Kansas town nearest to it!
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...)