What two numbers multiply to -643 and add up to -642?

Here we answer the question: "What two numbers multiply to -643 and add up to -642?"

The answer to your question is:

-643 and 1

Below we illustrate and prove that -643 and 1 multiply to -643 and add up to -642:

-643 × 1 = -643
-643 + 1 = -642

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

x² - 642x - 643 = 0

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

(x - 643 ) (x + 1)

To summarize, since -643 and 1 multiply to -643 and add up -642, you know that the following is true:

x² - 642x - 643 = (x - 643 ) (x + 1)

Multiply To One Number and Add Up To Another
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