There are no rational factors.
3x squared minus 25x minus 28
x2 - 9x + 20 = (x - 4)( x - 5)
(a + 3)(a - 3)
-20
(5x - 2y)(5x + 2y)
x(x - 25)(x - 25)
(x + 1)(x - 8)
Without that other number, all you've got is zero.
2x squared - 5x - 3 = (2x +1)(x -3)
Negative twenty nine minus negative twenty one is negative eight.
To do this, first we convert to twenty-eights. That gives us eight twenty-eights minus seven twenty-eights which equals one twenty-eight.
(3 - i)(3 + i)