What two numbers multiply to -404 and add up to 403?

Here we answer the question: "What two numbers multiply to -404 and add up to 403?"

The answer to your question is:

-1 and 404

Below we illustrate and prove that -1 and 404 multiply to -404 and add up to 403:

-1 × 404 = -404
-1 + 404 = 403

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

x² + 403x - 404 = 0

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

(x - 1 ) (x + 404)

To summarize, since -1 and 404 multiply to -404 and add up 403, you know that the following is true:

x² + 403x - 404 = (x - 1 ) (x + 404)

Multiply To One Number and Add Up To Another
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