What two numbers multiply to 640 and add up to -641?

Here we answer the question: "What two numbers multiply to 640 and add up to -641?"

The answer to your question is:

-640 and -1

Below we illustrate and prove that -640 and -1 multiply to 640 and add up to -641:

-640 × -1 = 640
-640 + -1 = -641

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

x² - 641x + 640 = 0

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

(x - 640 ) (x - 1)

To summarize, since -640 and -1 multiply to 640 and add up -641, you know that the following is true:

x² - 641x + 640 = (x - 640 ) (x - 1)

Multiply To One Number and Add Up To Another
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