The two numbers that multiply to 784 are -28 and -28, as -28 x -28 = 784. These two numbers also add up to -56, since -28 + (-28) = -56. This is because when you multiply two negative numbers, the result is positive, and when you add two negative numbers, the sum is negative.
Oh, dude, you're hitting me with some math here! So, the two numbers that multiply to 784 and add up to -56 are -28 and -28. Yeah, I know, it's like they're twins or something. So, there you have it, the thrilling world of algebra in action.