Question: The second derivative of the function C(x) = (x 4) 1 is (x) = 2(x 4)3. Although :(x) changes sign at x

The second derivative of the function C(x) = (x − 4)−1 is ƒ" (x) = 2(x − 4)−3. Although ƒ:(x) changes sign at x = 4, ƒ does not have a point of inflection at x = 4. Why not?

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