What two numbers multiply to -819 and add up to -18?

Here we answer the question: "What two numbers multiply to -819 and add up to -18?"

The answer to your question is:

-39 and 21

Below we illustrate and prove that -39 and 21 multiply to -819 and add up to -18:

-39 × 21 = -819
-39 + 21 = -18

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

x² - 18x - 819 = 0

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

(x - 39 ) (x + 21)

To summarize, since -39 and 21 multiply to -819 and add up -18, you know that the following is true:

x² - 18x - 819 = (x - 39 ) (x + 21)

Multiply To One Number and Add Up To Another
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