What two numbers multiply to -780 and add up to 388?

Here we answer the question: "What two numbers multiply to -780 and add up to 388?"

The answer to your question is:

-2 and 390

Below we illustrate and prove that -2 and 390 multiply to -780 and add up to 388:

-2 × 390 = -780
-2 + 390 = 388

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

x² + 388x - 780 = 0

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

(x - 2 ) (x + 390)

To summarize, since -2 and 390 multiply to -780 and add up 388, you know that the following is true:

x² + 388x - 780 = (x - 2 ) (x + 390)

Multiply To One Number and Add Up To Another
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