Posted by **Jacob** on Saturday, September 18, 2010 at 1:36am.

Use the product rule to calculate the derivative.

dh

dx

x = 4 ,

h (x) = (x^(-1/2) + 7x)(9 - x^-1)

very weird.. i know how to do it, i used product rule and got an answer in decimal but the website is not accepting it. Can any one help me?...

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