What two numbers multiply to -521 and add up to 520?

Here we answer the question: "What two numbers multiply to -521 and add up to 520?"

The answer to your question is:

-1 and 521

Below we illustrate and prove that -1 and 521 multiply to -521 and add up to 520:

-1 × 521 = -521
-1 + 521 = 520

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

x² + 520x - 521 = 0

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

(x - 1 ) (x + 521)

To summarize, since -1 and 521 multiply to -521 and add up 520, you know that the following is true:

x² + 520x - 521 = (x - 1 ) (x + 521)

Multiply To One Number and Add Up To Another
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