56, 112, 168, 224, 280, etc (you add 56 each time)
-56
3248
-46
569
82
28, 35, 42, 49, 56.
-604
96
56
There is no pair of real numbers which answers this question. You are trying to factor x2+8x+56? The discriminant, b2-4ac, = 82-4(1)(56) = 64-224 = -160. Since the discriminant is negative, the quadratic can't be factored.
686
1 x 112, 2 x 56, 4 x 28, 7 x 16, 8 x 14.