$$x= { \left(t-2 \right) }^{ 2 }$$
$t=-\sqrt{x}+2$
$t=\sqrt{x}+2$
$t=-\sqrt{x}+2$
$t=\sqrt{x}+2\text{, }x\geq 0$
$x=\left(t-2\right)^{2}$
