What two numbers multiply to -991 and add up to -990?

Here we answer the question: "What two numbers multiply to -991 and add up to -990?"

The answer to your question is:

-991 and 1

Below we illustrate and prove that -991 and 1 multiply to -991 and add up to -990:

-991 × 1 = -991
-991 + 1 = -990

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

x² - 990x - 991 = 0

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

(x - 991 ) (x + 1)

To summarize, since -991 and 1 multiply to -991 and add up -990, you know that the following is true:

x² - 990x - 991 = (x - 991 ) (x + 1)

Multiply To One Number and Add Up To Another
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