What two numbers multiply to -400 and add up to 198?

Here we answer the question: "What two numbers multiply to -400 and add up to 198?"

The answer to your question is:

-2 and 200

Below we illustrate and prove that -2 and 200 multiply to -400 and add up to 198:

-2 × 200 = -400
-2 + 200 = 198

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

x² + 198x - 400 = 0

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

(x - 2 ) (x + 200)

To summarize, since -2 and 200 multiply to -400 and add up 198, you know that the following is true:

x² + 198x - 400 = (x - 2 ) (x + 200)

Multiply To One Number and Add Up To Another
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