t^2+(2-t)^2=t^2+4t+8-2(16t+12t^2+4t^3+t^4)+4+t^2
t^2+4-4t+t^2=t^2+4t+8-32t-24t^2-8t^3-2t^4+4+t^2
2t^4+8t^3+24t^2+24t-8=0
t^4+4t^3+12t^2+12t-4=0
t^4+4t^3+12t^2+12t-4=0
方程左边没办法因式分解,请核对原方程是否有误?