What two numbers multiply to 638 and add up to -639?

Here we answer the question: "What two numbers multiply to 638 and add up to -639?"

The answer to your question is:

-638 and -1

Below we illustrate and prove that -638 and -1 multiply to 638 and add up to -639:

-638 × -1 = 638
-638 + -1 = -639

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

x² - 639x + 638 = 0

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

(x - 638 ) (x - 1)

To summarize, since -638 and -1 multiply to 638 and add up -639, you know that the following is true:

x² - 639x + 638 = (x - 638 ) (x - 1)

Multiply To One Number and Add Up To Another
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