(2-x)平方=16
2-x=±4
x=2±4
x1=6,x2=-2
4(x+1)平方-25=0
(x-1)^2=25/4
x-1=±5/2
x=1±5/2
x1=7/2 x2=-3/2
x平方-2x+1=3
(x-1)^2=3
x-1=±√3
x1=1+√3
x2=1-√3