What two numbers multiply to -688 and add up to 687?

Here we answer the question: "What two numbers multiply to -688 and add up to 687?"

The answer to your question is:

-1 and 688

Below we illustrate and prove that -1 and 688 multiply to -688 and add up to 687:

-1 × 688 = -688
-1 + 688 = 687

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

x² + 687x - 688 = 0

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

(x - 1 ) (x + 688)

To summarize, since -1 and 688 multiply to -688 and add up 687, you know that the following is true:

x² + 687x - 688 = (x - 1 ) (x + 688)

Multiply To One Number and Add Up To Another
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