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:

-9 and 99

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

-9 × 99 = -891
-9 + 99 = 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 - 9 ) (x + 99)

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

x² + 90x - 891 = (x - 9 ) (x + 99)

Multiply To One Number and Add Up To Another
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