
Kellogg S.
asked 04/26/22Identify all inflection points of f(x)=(1/x)+ln(x)
Looking at the graph the only inflection point I can see is (1,1), however, I'm not sure about that answer.
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1 Expert Answer
(1,1) is when the 1st derivative is 0 and the 2nd derivative is < 0 (It is a min)
An inflection point is where the curvature changes or the 2nd derivative changes sign (0 for most functions):
f''(x) = 2/x3-1/x2 set to 0 and x =2 is the inflection point location.
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Doug C.
(1,1) is not an inflection point, it is a relative (actually absolute) minimum. You can find the inflection point by finding the 2nd derivative and applying the test for concavity, i.e. does the 2nd derivative change sign on either side of the value where the 2nd derivative equals 0. Can you find the 2nd derivative, set it equal to zero, and solve for x?04/26/22