What two numbers multiply to -810 and add up to -81?

Here we answer the question: "What two numbers multiply to -810 and add up to -81?"

The answer to your question is:

-90 and 9

Below we illustrate and prove that -90 and 9 multiply to -810 and add up to -81:

-90 × 9 = -810
-90 + 9 = -81

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

x² - 81x - 810 = 0

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

(x - 90 ) (x + 9)

To summarize, since -90 and 9 multiply to -810 and add up -81, you know that the following is true:

x² - 81x - 810 = (x - 90 ) (x + 9)

Multiply To One Number and Add Up To Another
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