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

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

The answer to your question is:

-390 and -1

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

-390 × -1 = 390
-390 + -1 = -391

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

x² - 391x + 390 = 0

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

(x - 390 ) (x - 1)

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

x² - 391x + 390 = (x - 390 ) (x - 1)

Multiply To One Number and Add Up To Another
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