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:

1 and 638

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

1 × 638 = 638
1 + 638 = 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 + 1 ) (x + 638)

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

x² + 639x + 638 = (x + 1 ) (x + 638)

Multiply To One Number and Add Up To Another
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