What two numbers multiply to -665 and add up to 664?

Here we answer the question: "What two numbers multiply to -665 and add up to 664?"

The answer to your question is:

-1 and 665

Below we illustrate and prove that -1 and 665 multiply to -665 and add up to 664:

-1 × 665 = -665
-1 + 665 = 664

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

x² + 664x - 665 = 0

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

(x - 1 ) (x + 665)

To summarize, since -1 and 665 multiply to -665 and add up 664, you know that the following is true:

x² + 664x - 665 = (x - 1 ) (x + 665)

Multiply To One Number and Add Up To Another
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