What two numbers multiply to -990 and add up to -989?

Here we answer the question: "What two numbers multiply to -990 and add up to -989?"

The answer to your question is:

-990 and 1

Below we illustrate and prove that -990 and 1 multiply to -990 and add up to -989:

-990 × 1 = -990
-990 + 1 = -989

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

x² - 989x - 990 = 0

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

(x - 990 ) (x + 1)

To summarize, since -990 and 1 multiply to -990 and add up -989, you know that the following is true:

x² - 989x - 990 = (x - 990 ) (x + 1)

Multiply To One Number and Add Up To Another
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