What two numbers multiply to -391 and add up to -390?

Here we answer the question: "What two numbers multiply to -391 and add up to -390?"

The answer to your question is:

-391 and 1

Below we illustrate and prove that -391 and 1 multiply to -391 and add up to -390:

-391 × 1 = -391
-391 + 1 = -390

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

x² - 390x - 391 = 0

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

(x - 391 ) (x + 1)

To summarize, since -391 and 1 multiply to -391 and add up -390, you know that the following is true:

x² - 390x - 391 = (x - 391 ) (x + 1)

Multiply To One Number and Add Up To Another
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