This is the equation we want to factorize:
x2 - 11x + 18
And there are two answers (the numbers are the same, but +/- signs are inverted):
1. (x - 2)(x - 9) = x2 - 9x - 2x -(-18) = x2 - 11x + 18
2. (-x + 2)(-x +9) = x2 -9x -2x + 18 = x2 - 11x + 18
3x squared minus 25x minus 28
There are no rational factors.
(a + 3)(a - 3)
(5x - 2y)(5x + 2y)
2x squared - 5x - 3 = (2x +1)(x -3)
Without that other number, all you've got is zero.
(x + 1)(x - 8)
It is (A-1)(A+1) when factored
(3 - i)(3 + i)
(t + 1)(2t - 3)
(x + 2)(x - 4)
(x - 2)(2x + 3)