What two numbers multiply to -398 and add up to 397?

Here we answer the question: "What two numbers multiply to -398 and add up to 397?"

The answer to your question is:

-1 and 398

Below we illustrate and prove that -1 and 398 multiply to -398 and add up to 397:

-1 × 398 = -398
-1 + 398 = 397

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

x² + 397x - 398 = 0

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

(x - 1 ) (x + 398)

To summarize, since -1 and 398 multiply to -398 and add up 397, you know that the following is true:

x² + 397x - 398 = (x - 1 ) (x + 398)

Multiply To One Number and Add Up To Another
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