x^2-4x+1因式分解
问题描述：
x^2-4x+1因式分解
答
x²-4x+1
=x²-4x+4-4+1
=(x²-4x+4)+(-4+1)
=(x-2)²-3
=[(x-2)+√3][(x-2)-√3]
=(x-2+√3)(x-2-√3)