Justifying Points of Inflection on the AP Calculus Exam

[@thespeedyyoshi]

Wait, for 2:57 why does it matter that f'(x) is increasing or decreasing? I thought it only mattered when f'(x) is positive or negative.

[@PrincessDaisyTseng]

quick question- once u have the positive and negative on the sign charts, when u go to justify when do u use increasing/decreasing VS positive/negative? I've always been a bit confused about that- thank you!!!!!

[@PrincessDaisyTseng]

not just for POI but when it asks max/min etc..

[@turksvids]

In addition to this video you might find these videos helpful for understanding those ideas: justify max/min: kzbin.info/www/bejne/fGbGaZWdrbR5gK8 using f' and f'' to graph f: kzbin.info/www/bejne/qWW6dH9vZZydqLc Also there are a lot of FRQs with examples of write-ups for solutions. Here's my grid of video solutions: goo.gl/pT7JJ Hope some of this helps!

[@slappyyummy]

thanks for the videos! are you going to make videos on the 2019 BC free response when they release?

[@turksvids]

Definitely! I usually post them within a day of the questions being released. Good luck!

[@slappyyummy]

Thank you!