Thinkwell: Calculus I in 20 Minutes Part 2

Thank you youtube, I now feel a little optomistic about my upcoming class

Concavity is the SECOND derivative, you're talking about the FIRST derivative where the LINE decreases \ increases /

Think of it like this, if a person is POSITIVE, they are smiling ^ u ^ that's concave up
If a person is negative, they are frowning - n - that's concave down.

I wish you were my Prof when I suffered through this stuff.

actually guys, he's correct about his concavity

Its concave up man, check you calculus book ;-)

Eye feel smarter already!!!

Wow. Nice job. I would have freaked hadn't I already taken Calc 1. I had a good prof, though. I watched this for the sheer entertainment. And it was pretty entertaining.

Correct me if I'm worng but I think this guy is wrong about the top function (time 4:32 into the movie). He starts off by saying that the beginning is concave up but I think it is concave down because from left to right the concavity is decreasing. Am I right or am I tripping out?

IT doesn't matter "how concave" the graph is or whether the graph is flattening out, the graph is still concave up. If that portion of the curve was a cup, the top part would be the inside of the cup, so it is concave up.

@nepatriots1fan if the graph is shaped like a 'u' then its concave up; if its shaped like an inverted 'u' then its concave down. So he's not wrong