What two numbers multiply to 840 and add up to -841?

Here we answer the question: "What two numbers multiply to 840 and add up to -841?"

The answer to your question is:

-840 and -1

Below we illustrate and prove that -840 and -1 multiply to 840 and add up to -841:

-840 × -1 = 840
-840 + -1 = -841

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

x² - 841x + 840 = 0

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

(x - 840 ) (x - 1)

To summarize, since -840 and -1 multiply to 840 and add up -841, you know that the following is true:

x² - 841x + 840 = (x - 840 ) (x - 1)

Multiply To One Number and Add Up To Another
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