What two numbers multiply to -891 and add up to -90?

Here we answer the question: "What two numbers multiply to -891 and add up to -90?"

The answer to your question is:

-99 and 9

Below we illustrate and prove that -99 and 9 multiply to -891 and add up to -90:

-99 × 9 = -891
-99 + 9 = -90

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

x² - 90x - 891 = 0

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

(x - 99 ) (x + 9)

To summarize, since -99 and 9 multiply to -891 and add up -90, you know that the following is true:

x² - 90x - 891 = (x - 99 ) (x + 9)

Multiply To One Number and Add Up To Another
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