What two numbers multiply to -399 and add up to 2?

Here we answer the question: "What two numbers multiply to -399 and add up to 2?"

The answer to your question is:

-19 and 21

Below we illustrate and prove that -19 and 21 multiply to -399 and add up to 2:

-19 × 21 = -399
-19 + 21 = 2

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

x² + 2x - 399 = 0

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

(x - 19 ) (x + 21)

To summarize, since -19 and 21 multiply to -399 and add up 2, you know that the following is true:

x² + 2x - 399 = (x - 19 ) (x + 21)

Multiply To One Number and Add Up To Another
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