X2+X+1=0 X4+2X3+4X2+3X+2=?

X2+X+1=0 X4+2X3+4X2+3X+2=?

=x²﹙x²+x+1﹚+x﹙x²+x+1﹚+2﹙x²+x+1﹚=0