x^2 + 4x + 3 =0
3x^2 - 5x - 2 =0
2x^2 - 50 =0
3x^2 + 2x = 0
1/2 x^2 - 4x =0
x^2 - 2x - 3 = 0
x^2 - 5x =0
x^2 - 9 =0
x=-1 o x=-3
x=3 o x=-3
x=0 o x=-2/3
x=-1 o x=3
x=5 o x=-5
x=0 o x=5
x=0 o x=8
x=2 o x=-1/3
