x^2-4x+4=0
(x-2)^2=0
x=2
x^2-2x-2=0
x^2-2x+1-3=0
(x-1)^2-3=0
(x-1+√3)(x-1-√3)=0
x=1-√3或x=1+√3
4x^2-4x+4=0
x^2-x+1=0
x^2-x+1/4+3/4=0
(x-1/2)^2+3/4>0 方程无解
(3x+2)(x+3)=x+14
3x^2+11x+6-x-14=0
3x^2+10x-8=0
(3x-2)(x+4)=0
x=2/3或x=-4