Function must have negative value?

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Maheen Fazal
Maheen Fazal on 9 Apr 2019
Commented: madhan ravi on 9 Apr 2019
Hi, I am confused just clear me if I am wrong, why we need the negative value of the problem after taking second derivative to prove the function convex or concave? or it doesn't matter for solving it further that the value is positive or negative.

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