What two numbers multiply to -800 and add up to 398?

Here we answer the question: "What two numbers multiply to -800 and add up to 398?"

The answer to your question is:

-2 and 400

Below we illustrate and prove that -2 and 400 multiply to -800 and add up to 398:

-2 × 400 = -800
-2 + 400 = 398

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

x² + 398x - 800 = 0

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

(x - 2 ) (x + 400)

To summarize, since -2 and 400 multiply to -800 and add up 398, you know that the following is true:

x² + 398x - 800 = (x - 2 ) (x + 400)

Multiply To One Number and Add Up To Another
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