What two numbers multiply to -393 and add up to -128?

Here we answer the question: "What two numbers multiply to -393 and add up to -128?"

The answer to your question is:

-131 and 3

Below we illustrate and prove that -131 and 3 multiply to -393 and add up to -128:

-131 × 3 = -393
-131 + 3 = -128

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

x² - 128x - 393 = 0

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

(x - 131 ) (x + 3)

To summarize, since -131 and 3 multiply to -393 and add up -128, you know that the following is true:

x² - 128x - 393 = (x - 131 ) (x + 3)

Multiply To One Number and Add Up To Another
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