204

$\sqrt{2x-1}=4$
$x=8{,}5$
$\sqrt{2\left(8{,}5\right)-1}=4$
$\sqrt{17-1}=4$
$\sqrt{16}=4$

$\sqrt[3]{1-x}=-2$
$x=9$
$\sqrt[3]{1-9}=-2$
$\sqrt[3]{-8}=-2$

$\sqrt{x^2-2x-2}=1$
$\left(\sqrt{x^2-2x-2}\right)^2=1^2$
$x^2-2x-2=1$
$x=-1\ tai\ x=3$