I guess I'm not understanding the concept for part of this, what should I know?
I'm posting my answers below, I would like to know what I did incorrectly in the middle part.
Yes I realize this is about identifying concavity and how to do that, but I want to know how to do the notation as shown, what that means I need to do mathematically, in steps.
I'll be back tomorrow to check on this :-)

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