What two numbers multiply to -685 and add up to 684?

Here we answer the question: "What two numbers multiply to -685 and add up to 684?"

The answer to your question is:

-1 and 685

Below we illustrate and prove that -1 and 685 multiply to -685 and add up to 684:

-1 × 685 = -685
-1 + 685 = 684

Are you asking because you are trying to figure out how to factor the following quadratic equation?

x² + 684x - 685 = 0

If so, the solution to factor the quadratic equation above is:

(x - 1 ) (x + 685)

To summarize, since -1 and 685 multiply to -685 and add up 684, you know that the following is true:

x² + 684x - 685 = (x - 1 ) (x + 685)

Multiply To One Number and Add Up To Another
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