$\left(-\infty,-\frac{1}{3}\right) \cup[1,2) \cup\left[\frac{5}{2}, \infty\right)$

$(-\infty, 1) \cup(2, \infty)$

$\left(-\frac{1}{3}, \frac{5}{2}\right]$

$\left(-\infty, \frac{-1}{3}\right) \cup\left[\frac{5}{2}, \infty\right)$

$[3, \infty)$

$[1, \infty)$

$[2, \infty)$

$(0,2] \cup[3, \infty)$

$4\left[\begin{array}{lll}3 & 2 & -3 \\ 3 & 0 & -3 \\ 3 & 2 & -3\end{array}\right]$

$\left[\begin{array}{lll}12 & 8 & 12 \\ 12 & 0 & 12 \\ 12 & 8 & 12\end{array}\right]$

$4\left[\begin{array}{ccc}3 & -2 & -3 \\ 3 & 0 & -3 \\ 3 & -2 & -3\end{array}\right]$

$\left[\begin{array}{lll}-12 & 8 & 12 \\ -12 & 0 & 12 \\ -12 & 8 & 12\end{array}\right]$