(1)2x2+3x-1=0,
2x2+3x=1,
x2+
3
2x=
1
2,
平配方得:x2+
3
2x+(
3
4)2=
1
2+(
3
4)2,
(x+
3
4)2=
17
16,
开方得:x+
3
4=±
17
4,
x1=
−3+
17
4,x2=-
3+
17
4;
(2)x2+4x-2=0,
b2-4ac=42-4×1×(-2)=24,
x=
−4±
24
2,
x1=-2+
6,x2=-2-
6;
(3)(2x+1)2=(x-3)2,
开方得:2x+1=±(x-3),
2x+1=x-3,2x+1=-(x-3),
x1=-4,x2=
2
3.