3x^2-4x-2=0
3(x-2/3)^2=10/3
(x-2/3)^2=10/9
x-2/3=± √10/3
x=(2±√10)/3
2x^2+8x-3=0
2(x+2)^2=11
(x+2)^2=11/2
x+2=±√22/2
x=(-2±√22)/2
3x^2-4x-2=0
3(x-2/3)^2=10/3
(x-2/3)^2=10/9
x-2/3=± √10/3
x=(2±√10)/3
2x^2+8x-3=0
2(x+2)^2=11
(x+2)^2=11/2
x+2=±√22/2
x=(-2±√22)/2