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

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

The answer to your question is:

-641 and -1

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

-641 × -1 = 641
-641 + -1 = -642

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

x² - 642x + 641 = 0

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

(x - 641 ) (x - 1)

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

x² - 642x + 641 = (x - 641 ) (x - 1)

Multiply To One Number and Add Up To Another
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