Determine the points of maxima and minim...

Determine the points of maxima and minima of the function
f(x)`=(1)/(8)log x-bx+x^(2), x gt 0`, where `b ge 0` is a constant.

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The correct Answer is:

Min at `x=(1)/(4)(b+sqrt(b^(2)-1))` and Max. at `x=(1)/(4)(b-sqrt(b^(2)-1))`

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