(x-根号3)^2=4x-4根号3
(x-根号3)^2=4(x-根号3)
(x-根号3)^2-4(x-根号3)=0
(x-根号3)[(x-根号3)-4]=0
(x-根号3)=0
x1=根号3
(x-根号3)-4=0
(x-根号3)=4
x2=4+根号3