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![\bf ~\hspace{7em}\textit{negative exponents} \\\\ a^{-n} \implies \cfrac{1}{a^n} ~\hspace{4.5em} a^n\implies \cfrac{1}{a^{-n}} ~\hspace{4.5em} \cfrac{a^n}{a^m}\implies a^na^{-m}\implies a^{n-m} \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ \boxed{13}\qquad m^{-9}\cdot m^5\implies m^{-9+5}\implies m^{-4}\implies \cfrac{1}{m^4}](/tpl/images/0045/4738/a5137.png)
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You know the right answer?
Ineed an explanation too so i could do this in class....
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