分析:由于x6+4x5+2x4-6x3-3x2+2x+l=[(x3+2x2)2-(2x4+6x3+4x2)+(x+1)2]=[(x3+2x2)2-2(x3+2x2)(x+1)+(x+1)2]=[(x3+2x2-x-1)2.從而得出f(x)的值.
解答:解:∵[f(x)]2=x6+4x5+2x4-6x3-3x2+2x+l
=[(x3+2x2)2-(2x4+6x3+4x2)+(x+1)2]
=[(x3+2x2)2-2(x3+2x2)(x+1)+(x+1)2]
=[(x3+2x2-x-1)2.
∴f(x)=±(x3+2x2-x-1).
故答案為:±(x3+2x2-x-1).
點評:本題考查了因式分解的應用,解題的關鍵是將x6+4x5+2x4-6x3-3x2+2x+l分解為[(x3+2x2-x-1)2.