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What should be multiplied by 3^{-13} to get 81? Please answer ASAP. Needed urgently for tomorrow's exam!

Please find below the solution to the asked query :

$\mathrm{Let}\mathrm{the}\mathrm{number}\mathrm{to}\mathrm{be}\mathrm{multiplied}\mathrm{be}\mathrm{x}.\phantom{\rule{0ex}{0ex}}\mathrm{So},\phantom{\rule{0ex}{0ex}}{3}^{-13}\left(\mathrm{x}\right)=81\phantom{\rule{0ex}{0ex}}\mathrm{x}=\frac{{3}^{4}}{{3}^{-13}}={3}^{4+13}\phantom{\rule{0ex}{0ex}}\mathrm{x}={3}^{17}\mathrm{ANS}...$

$\mathrm{Let}\mathrm{the}\mathrm{number}\mathrm{to}\mathrm{be}\mathrm{multiplied}\mathrm{be}\mathrm{x}.\phantom{\rule{0ex}{0ex}}\mathrm{So},\phantom{\rule{0ex}{0ex}}{3}^{-13}\left(\mathrm{x}\right)=81\phantom{\rule{0ex}{0ex}}\mathrm{x}=\frac{{3}^{4}}{{3}^{-13}}={3}^{4+13}\phantom{\rule{0ex}{0ex}}\mathrm{x}={3}^{17}\mathrm{ANS}...$

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