What two numbers multiply to -784 and add up to 390?

Here we answer the question: "What two numbers multiply to -784 and add up to 390?"

The answer to your question is:

-2 and 392

Below we illustrate and prove that -2 and 392 multiply to -784 and add up to 390:

-2 × 392 = -784
-2 + 392 = 390

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

x² + 390x - 784 = 0

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

(x - 2 ) (x + 392)

To summarize, since -2 and 392 multiply to -784 and add up 390, you know that the following is true:

x² + 390x - 784 = (x - 2 ) (x + 392)

Multiply To One Number and Add Up To Another
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