What two numbers multiply to 391 and add up to -40?

Here we answer the question: "What two numbers multiply to 391 and add up to -40?"

The answer to your question is:

-23 and -17

Below we illustrate and prove that -23 and -17 multiply to 391 and add up to -40:

-23 × -17 = 391
-23 + -17 = -40

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

x² - 40x + 391 = 0

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

(x - 23 ) (x - 17)

To summarize, since -23 and -17 multiply to 391 and add up -40, you know that the following is true:

x² - 40x + 391 = (x - 23 ) (x - 17)

Multiply To One Number and Add Up To Another
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