#### tony873004

Science Advisor

Gold Member

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[tex]

\begin{array}{l}

f(x) = x - 5(x - 1)^{2/5} \\

\\

f'(x) = \frac{{f(x + h) - f(x)}}{h} = \frac{{(x + h) - 5((x + h) - 1)^{2/5} - \left( {x - 5(x - 1)^{2/5} } \right)}}{h} \\

\end{array}

[/tex]