Consider the following. $($If an answer does not exist, enter DNE.$)$

$f(x)=ln(x^{2}6)$

Find the interval$($s$)$ on which $f$ is concave up$.($Enter your answer using interval notation.$)$

$$

Find the interval$($s$)$ on which $f$ is concave down. $($Enter your answer using interval notation.$)$

$$

Find the inflection points of $f.$

smatter $x-$value $(x,y)=()$

larger $x-$value $)$