Answer
(a) $-2.94$, $-0.11$, and $3.05$
(b) $-1\leq x\leq2$
Work Step by Step
(a) Graph the equation as shown with the red curve in the figure. There are three x-intercepts which represent the solutions of the equation, they are $x=-2.94$, $x=-0.11$, and $x=3.05$
(b) Graph the inequality as shown with the blue region in the figure. The range of the region provides the solution to the inequality, which is $x\in [-1,2]$