解:设x^2+x=t,则原方程转化为t(t-3)=-2,t^2-3t+2=0,(t-1)(t-2)=0∴t1=1,t2=2当t=1时,x^2+x=1,x^2+x-1=0,x=(-1±√5)/2;当t=2时,x^2+x=2,x^2+x-2=0,x=(-1±3)/2,即x1=1,x2=-2
如图