Answer
\begin{aligned}
&\frac{f(x)-f(a)}{x-a}\\
&\frac{f(a+h)-f(a)}{h}
\end{aligned}
Work Step by Step
The two ways of writing the difference quotient are
\begin{aligned}
&\frac{f(x)-f(a)}{x-a}\\
&\frac{f(a+h)-f(a)}{h}
\end{aligned}
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