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For what values of x is $f (x) = x + \frac{1}{x}$ $f(x)= x + 1/x$ concave or convex?

1 Answer

A. S. Adikesavan

Mar 14, 2016

Concave or convex according as x < or > 0.

Explanation:

#(d^2/dx^2)f( x )= 2/x^3 < 0 or > 0 according as x < 0 or > 0..

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