因式分解 x2-5x+3
问题描述:
因式分解 x2-5x+3
答
用配方法.
x^2-5x+3
=x^2-5x+25/4+3-25/4
=(x-5/2)^2-13/4
=(x-5/2+√13/2)(x-5/2-√13/2)
=[x-(5+√13)/2][x-(5-√13)/2]