What two numbers multiply to -642 and add up to -641?

Here we answer the question: "What two numbers multiply to -642 and add up to -641?"

The answer to your question is:

-642 and 1

Below we illustrate and prove that -642 and 1 multiply to -642 and add up to -641:

-642 × 1 = -642
-642 + 1 = -641

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

x² - 641x - 642 = 0

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

(x - 642 ) (x + 1)

To summarize, since -642 and 1 multiply to -642 and add up -641, you know that the following is true:

x² - 641x - 642 = (x - 642 ) (x + 1)

Multiply To One Number and Add Up To Another
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