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

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

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 -991:

-990 × -1 = 990
-990 + -1 = -991

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

x² - 991x + 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 -991, you know that the following is true:

x² - 991x + 990 = (x - 990 ) (x - 1)

Multiply To One Number and Add Up To Another
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