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Generating Function

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How to apply this theorem to $\frac{x^{3}}{1-x}$ 

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G(x) = $x^{3}.\frac{1}{1-x}$

G(x) = $x^{3}[1+x+x^{2}+x^{3}+x^{4}+...............................]$     

G(x) = $x^{3}+x^{4}+x^{5}+x^{6}+.................................$
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