What two numbers multiply to -638 and add up to 637?

Here we answer the question: "What two numbers multiply to -638 and add up to 637?"

The answer to your question is:

-1 and 638

Below we illustrate and prove that -1 and 638 multiply to -638 and add up to 637:

-1 × 638 = -638
-1 + 638 = 637

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

x² + 637x - 638 = 0

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

(x - 1 ) (x + 638)

To summarize, since -1 and 638 multiply to -638 and add up 637, you know that the following is true:

x² + 637x - 638 = (x - 1 ) (x + 638)

Multiply To One Number and Add Up To Another
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