3x^2-25x-28=0,
D=961,
x1=-1,
x2=9 1/3,
3x^2-25x-28=3(x+1)(x-9 1/3)=(x+1)(x-28)
2x^2+13x-7=0,
D=225,
x1=-7,
x2=1/2,
2x^2+13x-7=2(x+7)(x-1/2)=(x+7)(x-1)
3x^2-25x-28=0,
D=961,
x1=-1,
x2=9 1/3,
3x^2-25x-28=3(x+1)(x-9 1/3)=(x+1)(x-28)
2x^2+13x-7=0,
D=225,
x1=-7,
x2=1/2,
2x^2+13x-7=2(x+7)(x-1/2)=(x+7)(x-1)