Sende eine Gleichung am besten ohne neg. Exponenten, dann kann man es besser erklären !
Es geht dann über das Logarithmieren !
$${{\mathtt{e}}}^{{\mathtt{\,-\,}}\left({\mathtt{0.5}}{\mathtt{\,\times\,}}{{\mathtt{x}}}^{{\mathtt{2}}}\right)}$$ => $${\mathtt{\,-\,}}\left({\mathtt{0.5}}{\mathtt{\,\times\,}}{{\mathtt{x}}}^{{\mathtt{2}}}{\mathtt{\,\times\,}}{log}_{10}\left({\mathtt{e}}\right)\right)$$
$${{\mathtt{3}}}^{\left({{\mathtt{x}}}^{{\mathtt{2}}}\right)} = {\mathtt{81}}$$ => $${{\mathtt{x}}}^{{\mathtt{2}}}{\mathtt{\,\times\,}}{log}_{10}\left({\mathtt{3}}\right) = {log}_{10}\left({\mathtt{81}}\right)$$ => $${{\mathtt{x}}}^{{\mathtt{2}}} = {\frac{{log}_{10}\left({\mathtt{81}}\right)}{{log}_{10}\left({\mathtt{3}}\right)}}$$
$${\mathtt{x}} = {\sqrt{{\frac{{log}_{10}\left({\mathtt{81}}\right)}{{log}_{10}\left({\mathtt{3}}\right)}}}} \Rightarrow {\mathtt{x}} = {\mathtt{2}}$$
Gruß radix 
!
+14538 
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