What two numbers multiply to -321 and add up to 320?

Here we answer the question: "What two numbers multiply to -321 and add up to 320?"

The answer to your question is:

-1 and 321

Below we illustrate and prove that -1 and 321 multiply to -321 and add up to 320:

-1 × 321 = -321
-1 + 321 = 320

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

x² + 320x - 321 = 0

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

(x - 1 ) (x + 321)

To summarize, since -1 and 321 multiply to -321 and add up 320, you know that the following is true:

x² + 320x - 321 = (x - 1 ) (x + 321)

Multiply To One Number and Add Up To Another
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