Question

equação 2°grau
1^-1-20=0

Answer 1

$1^{-1}$-1-20=0
$\frac{1}{10}$-1-20=0
$\frac{1-10-200}{10}$=0
$\frac{-9-200}{10}$ = $\frac{-209}{10}$
= -20,9