Question

Qual é a raiz quadrada de √400​

Answer 1

Raiz quadrada por fatoração

$\begin{array}{c|c}\sf400&\sf2\\\sf200&\sf2\\\sf100&\sf2\\\sf50&\sf2\\\sf25&\sf5\\\sf5&\sf5\\\sf1\end{array}$

$\mathsf{\sqrt{400}=\sqrt{2^2\cdot2^2\cdot5^2} }$

$\mathsf{ \sqrt{400}=2\cdot2\cdot5}$

$\boxed{\boxed{\mathsf{\sqrt{400}=20 }}}$