1.
(3x-2)²-1=0
(3x-2+1)(3x-2-1)=0
x1=1,x2=3
2.
x²+8x-16=0
(x+4)²-32=0
x1=-4-4根号2,x2=-4+4根号2
3.
x²+4x+4-5=0
(x+2)²-5=0
x1=-2-根号5,x2=-2+根号5
4.
x-根号2－5x（根号2-x）=0
(x-根号2)(1+5x)=0
x1=根号2,x2=-0.2