Homework Help: calculus

Posted by dylan on Sunday, April 24, 2011 at 11:06pm.

I posted one before but this is another one of those problems that i need help with! I don't know how to approach this one at all!
Please help
use the definition of the derivative to find f'(x) when
f(x)= (4/x^2)+(2/5*x)

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