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

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

The answer to your question is:

-1 and 841

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

-1 × 841 = -841
-1 + 841 = 840

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

x² + 840x - 841 = 0

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

(x - 1 ) (x + 841)

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

x² + 840x - 841 = (x - 1 ) (x + 841)

Multiply To One Number and Add Up To Another
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