What two numbers multiply to -399 and add up to 50?

Here we answer the question: "What two numbers multiply to -399 and add up to 50?"

The answer to your question is:

-7 and 57

Below we illustrate and prove that -7 and 57 multiply to -399 and add up to 50:

-7 × 57 = -399
-7 + 57 = 50

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

x² + 50x - 399 = 0

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

(x - 7 ) (x + 57)

To summarize, since -7 and 57 multiply to -399 and add up 50, you know that the following is true:

x² + 50x - 399 = (x - 7 ) (x + 57)

Multiply To One Number and Add Up To Another
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