x方-4x-6=0的跟
问题描述：
x方-4x-6=0的跟
答
x²-4x+4=6+4
(x-2)²=10
x-2=±√10
x=2-√10,x=2+√10
x方-4x-6=0的跟
x²-4x+4=6+4
(x-2)²=10
x-2=±√10
x=2-√10,x=2+√10