#127 Concavity    July 01, 2007


boydog127 D:aww... don't be so negative D:turn that frown into a positive double derivative!

A little bit of calculus is good for everyone. You can tell whether a function is concave up or down be taking its double derivative. If the result is a negative number then it is concave down (like the curve of a frowny face). If the result is a positive number then it is concave up (like a smiley face!) I hope everyone's mouths are having a concave up day!


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