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:

-1 and 990

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

-1 × 990 = -990
-1 + 990 = 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 - 1 ) (x + 990)

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

x² + 989x - 990 = (x - 1 ) (x + 990)

Multiply To One Number and Add Up To Another
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