Using synthetic division:
#{:
(,,color(gray)(b^3),color(gray)(b^2),color(gray)(b^1),color(gray)(b^0)),
(," | ",1,+8,-20,color(white)("x")0),
(+," | ",ul(" "),ul(color(white)("0")2),ul(color(white)("xx")20),ul(color(white)("x")0)),
(xx 2," | ",1,10,color(white)("xx")0,color(white)("x")0),
(,,color(gray)(b^2),color(gray)(b^1),color(white)("x")color(gray)(b^0),color(gray)("R"))
:}#