Is #f(x)=1/x^3-x^3# concave or convex at #x=1#?
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1 Answer
Jan 6, 2016
Concave up.
Explanation:
First of all get f '' (x). f '(x)=
At x=1, f ''(x)=6 which f ''(x) >0. That means f(x) is concave up.
