What two numbers multiply to -840 and add up to 839?

Here we answer the question: "What two numbers multiply to -840 and add up to 839?"

The answer to your question is:

-1 and 840

Below we illustrate and prove that -1 and 840 multiply to -840 and add up to 839:

-1 × 840 = -840
-1 + 840 = 839

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

x² + 839x - 840 = 0

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

(x - 1 ) (x + 840)

To summarize, since -1 and 840 multiply to -840 and add up 839, you know that the following is true:

x² + 839x - 840 = (x - 1 ) (x + 840)

Multiply To One Number and Add Up To Another
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