初中因式分解

因式分解(x-n^2-3n+5)*(x-n^2-n+2)*(x-n^2+n-1)*(x-n^2+4n+4)+(2n-3)^4恒等式:a1,a2,a3,a4是等差数列,d为公差，则(x+a1)*(x+a2)*(x+a3)(x+a4)+d^4=[x^2+(2a1+3d)x+(a1)^2+3a1*d+d^2]^2.符合这个恒等式.可分解。