The tables below show some inputs and outputs of functions $g$ and $h$.
$x$|$-6$|$-4$|$-2$|$-1$|$~~0$|$~~2$
:-:|-:|-:|-:|-:|-:|-:|-:
${g(x)}$|${-21}$|${3}$|${11}$|${9}$|${3}$| ${-21}$
$x$|$-1$|$~~0$|$~~2$|$~~3$|$~~4$|$~6$|
:-:|-:|-:|-:|-:|-:|-:|-:
${h(x)}$|${5}$|${2}$|${2}$|${5}$|${10}$| ${26}$
$(h\circ g)(0)= $ [[☃ math-keypad 1]]