Originally Posted by

**Hydralisk** Hi all,

I have been asked to differentiate the function $\displaystyle f(x)=\frac{5}{x}$ where $\displaystyle (x>0)$. I have not been asked previously in exercises (or taught for that matter) how to differentiate fractions like this. I have used Mathcad to find the solution $\displaystyle -\frac{5}{x^2}$ hoping it would reveal a method to me, but with no such luck. I would really appreciate any help on this. I think it may be a rule for powers prior to finding the derivative that I am missing.

Regards,

Shayne.