Question

$\sqrt{2 { - }^{2} }$

Answer 1

A resposta é zero '.'

$\sqrt{2-2}$
                  ↑
                  2-2=0

Answer 2

$\sqrt{2^{-2}}\\\\ \sqrt{ (\frac{1}{2})^{2} } \\\\ \frac{1}{2}$