Question

qual a raiz quadrada de 81​

Answer 1

Raiz quadrada por fatoração

$\begin{array}{r|l}\sf81&\sf3\\\sf27&\sf3\\\sf9&\sf3\\\sf3&\sf3\\\sf1\end{array}$

$\mathsf{ \sqrt{81}=\sqrt{3^2\cdot3^2}}$

$\mathsf{\sqrt{81}=3\cdot3 }$

$\boxed{\boxed{\mathsf{\sqrt{81}=9 }}}$