Function must have negative value?

9 Apr 2019
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Updated 9 Apr 2019
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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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Asked:

Maheen Fazal
Maheen Fazal
on 9 Apr 2019

Commented:

madhan ravi
madhan ravi
on 9 Apr 2019

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