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:

1 and 990

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

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

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

x² + 991x + 990 = (x + 1 ) (x + 990)

Multiply To One Number and Add Up To Another
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