Question

​raiz quadrada de 81

Answer 1

$\sqrt{81} = 9$

pois 9×9=81

Answer 2

Raiz quadrada por fatoração

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

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

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

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