What two numbers multiply to -424 and add up to 423?

Here we answer the question: "What two numbers multiply to -424 and add up to 423?"

The answer to your question is:

-1 and 424

Below we illustrate and prove that -1 and 424 multiply to -424 and add up to 423:

-1 × 424 = -424
-1 + 424 = 423

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

x² + 423x - 424 = 0

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

(x - 1 ) (x + 424)

To summarize, since -1 and 424 multiply to -424 and add up 423, you know that the following is true:

x² + 423x - 424 = (x - 1 ) (x + 424)

Multiply To One Number and Add Up To Another
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