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:

-21 and 39

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

-21 × 39 = -819
-21 + 39 = 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 - 21 ) (x + 39)

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

x² + 18x - 819 = (x - 21 ) (x + 39)

Multiply To One Number and Add Up To Another
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