Question

$f\left(x\right)=\sqrt{\left[x\right]-2}$. Find range domain $[-2,\infty ]$

Answer 1

$f\left(x\right)=\sqrt{\left[x\right]-2}$
Domain : $\left[x\right]-2\ge 0$
$\left[x\right]\ge 2$
$x\ge 2\Rightarrow xϵ[2,\infty ]$