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i got another quistion do i have to find f(-4) and f''(-4) ? or is it just f(4) and f''(-4) ? cause it is > o

thanks for your help :)

thank you but isn't the second derivative test only to determine the max or min relative ? not absolute extrema?

find the absolute maximum and absolute minimum (if any) for the given function : f(x)= 2x + 32/x ; when x > 0 I tried to solve it but I'm not sure if its a maxima or minima, here are my try : f(x)= 2x + 32/x f'(x)= 2-32/x^2 2-32/x^2=0 2u^2=32 u^2=16 u=4 or - 4 -4 is not included...

Homework Statement I have a homework that i couldn't do :( can you explain it to me please ? the problem is : find all values of x=c so that the tangent line to the graph of f(x) af (c , f(c)) will be horizontal http://img13.imageshack.us/img13/4222/scan0002izs.jpg [Broken] The...