What two numbers multiply to 810 and add up to -99?

Here we answer the question: "What two numbers multiply to 810 and add up to -99?"

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 -99:

-90 × -9 = 810
-90 + -9 = -99

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

x² - 99x + 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 -99, you know that the following is true:

x² - 99x + 810 = (x - 90 ) (x - 9)

Multiply To One Number and Add Up To Another
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