What two numbers multiply to -721 and add up to 720?

Here we answer the question: "What two numbers multiply to -721 and add up to 720?"

The answer to your question is:

-1 and 721

Below we illustrate and prove that -1 and 721 multiply to -721 and add up to 720:

-1 × 721 = -721
-1 + 721 = 720

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

x² + 720x - 721 = 0

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

(x - 1 ) (x + 721)

To summarize, since -1 and 721 multiply to -721 and add up 720, you know that the following is true:

x² + 720x - 721 = (x - 1 ) (x + 721)

Multiply To One Number and Add Up To Another
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