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$\fraction{f (x + \Delta x) - f (x)}{x \Delta x} $
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\frac{f\left(x+\Delta x\right)-fx}{x^{2}\Delta }
Multiply x and x to get x^{2}.
\frac{fx\Delta }{\Delta x^{2}}
Factor the expressions that are not already factored.
\frac{f}{x}
Cancel out x\Delta in both numerator and denominator.
\frac{f\left(x+\Delta x\right)-fx}{x^{2}\Delta }
Multiply x and x to get x^{2}.
\frac{fx\Delta }{\Delta x^{2}}
Factor the expressions that are not already factored.
\frac{f}{x}
Cancel out x\Delta in both numerator and denominator.