What two numbers multiply to -680 and add up to 679?

Here we answer the question: "What two numbers multiply to -680 and add up to 679?"

The answer to your question is:

-1 and 680

Below we illustrate and prove that -1 and 680 multiply to -680 and add up to 679:

-1 × 680 = -680
-1 + 680 = 679

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

x² + 679x - 680 = 0

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

(x - 1 ) (x + 680)

To summarize, since -1 and 680 multiply to -680 and add up 679, you know that the following is true:

x² + 679x - 680 = (x - 1 ) (x + 680)

Multiply To One Number and Add Up To Another
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