What two numbers multiply to -821 and add up to 820?

Here we answer the question: "What two numbers multiply to -821 and add up to 820?"

The answer to your question is:

-1 and 821

Below we illustrate and prove that -1 and 821 multiply to -821 and add up to 820:

-1 × 821 = -821
-1 + 821 = 820

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

x² + 820x - 821 = 0

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

(x - 1 ) (x + 821)

To summarize, since -1 and 821 multiply to -821 and add up 820, you know that the following is true:

x² + 820x - 821 = (x - 1 ) (x + 821)

Multiply To One Number and Add Up To Another
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