(D^4+2D^3+2D^2+1)Y=0
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D^4+2D^3+2D^2+1=0
D^4+D^3+D^3+D^2+D^2+1D=0
D^3 (D+1)+D^2 (D+1)+D (D+1)=0
(D+1)(D^3+D^2+D)=0
D=-1
D^4+D^3+D^3+D^2+D^2+1D=0
D^3 (D+1)+D^2 (D+1)+D (D+1)=0
(D+1)(D^3+D^2+D)=0
D=-1
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