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:

-1 and 991

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

-1 × 991 = -991
-1 + 991 = 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 - 1 ) (x + 991)

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

x² + 990x - 991 = (x - 1 ) (x + 991)

Multiply To One Number and Add Up To Another
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