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

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

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 -643:

-642 × -1 = 642
-642 + -1 = -643

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

x² - 643x + 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 -643, you know that the following is true:

x² - 643x + 642 = (x - 642 ) (x - 1)

Multiply To One Number and Add Up To Another
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