Answer
$a.\qquad $see image below
$b.\quad (-\infty,\infty)$
$c.\quad $Decreases on$ (-1.16,1.16)$
Increases on $( -\infty,-1.16)\cup(1.16,\infty)$
Work Step by Step
$a.$
(graphed with online graphic calculator at desmos.com)
$b.$
$f$ is defined for all reals, $(-\infty,\infty)$
$c.$
f has a local maximum at $x\approx-1.16,$
and a local minimum at $x\approx 1.16.$
Decreases on$ (-1.16,1.16)$
Increases on $( -\infty,-1.16)\cup(1.16,\infty)$