2x的平方-4x-1=0

问题描述:

2x的平方-4x-1=0

2x平方-4x-1=0
2x^2-4x+2=3
2(x^2-2x+1)=3
2(x-1)^2=3
(x-1)^2=3/2
x-1=±√6/2
x=1±√6/2