What two numbers multiply to 990 and add up to -109?

Here we answer the question: "What two numbers multiply to 990 and add up to -109?"

The answer to your question is:

-99 and -10

Below we illustrate and prove that -99 and -10 multiply to 990 and add up to -109:

-99 × -10 = 990
-99 + -10 = -109

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

x² - 109x + 990 = 0

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

(x - 99 ) (x - 10)

To summarize, since -99 and -10 multiply to 990 and add up -109, you know that the following is true:

x² - 109x + 990 = (x - 99 ) (x - 10)

Multiply To One Number and Add Up To Another
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