(1)x^2-4x+1=0
x²-4x=-1
x²-4x+4=3
(x-2)²=3
x-2=±√3
x1=2+√3,x2=2-√3
(2)3x^2-6x+3=1/3
3(x-1)²=1/3
(x-1)²=1/9
x-1=±1/3
x1=4/3,x2=2/3