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Why is second order derivative positive in minima and negative in maxima?

Why is second order derivative positive in minima and negative in maxima?

Grade:11

1 Answers

Riddhish Bhalodia
askIITians Faculty 434 Points
5 years ago
Ok let me give you an intuitive feeling about this
Imagine a differential curve with a local maxima (basically a peak).
Now can you imagine that (shown in figure) that the slope goes from positive to zero to negative moving right on the x axis. This means the change in the slope is negative
and the change in the slope wrt x is nothing but the second derivative
hence the second derivative at maxima is negative
Similar argument can be constructed at local minima

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