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:

-400 and 2

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

-400 × 2 = -800
-400 + 2 = -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 - 400 ) (x + 2)

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

x² - 398x - 800 = (x - 400 ) (x + 2)

Multiply To One Number and Add Up To Another
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