Question

A equação 3×=81 em R vale:

Answer 1

$\large\boxed{\begin{array}{l}\rm A\,equac_{\!\!,}\tilde ao\,3^x=81\,em\,\mathbb{R}\,vale:\\\underline{\sf soluc_{\!\!,}\tilde ao:}\\\begin{array}{c|l}\rm81&\rm3\\\rm27&\rm3\\\rm9&\rm3\\\rm3&\rm3\\\rm1\end{array}\\\rm 81=3^4\\\rm 3^x=81\\\rm 3^x=3^4\\\rm x=4\end{array}}$

Answer 2

✅ Após resolver a equação do primeiro grau, concluímos que seu conjunto solução é:

 $\Large\displaystyle\text{ \begin{gathered}\boxed{\boxed{\:\:\:\bf S = \{27\}\:\:\:}}\end{gathered} }$

Resolvendo equação do primeiro grau:

        $\Large\displaystyle\begin{gathered}\tt 3x = 81\end{gathered}$

          $\Large\displaystyle\begin{gathered}\tt x = \frac{81}{3}\end{gathered}$

          $\Large\displaystyle\begin{gathered}\tt x = 27\end{gathered}$

✅ Portanto, o conjunto solução é:

          $\Large\displaystyle\begin{gathered}\tt S = \{27\}\end{gathered}$

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