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:

-3 and 131

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

-3 × 131 = -393
-3 + 131 = 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 - 3 ) (x + 131)

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

x² + 128x - 393 = (x - 3 ) (x + 131)

Multiply To One Number and Add Up To Another
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