a(a-1)^2+3a=a(2a)^2+3a,a(a^2-2a+1)+3a=4a^3+3aa^3-2a^2+a+3a=4a^3+3a-3a^3-2a^2+a=0,3a^3+2a^2-a=0a(3a^2+2a-1)=0a(3a-1)(a+1)=0a1=0.a2=1/3,a3=-1
