What two numbers multiply to -661 and add up to 660?

Here we answer the question: "What two numbers multiply to -661 and add up to 660?"

The answer to your question is:

-1 and 661

Below we illustrate and prove that -1 and 661 multiply to -661 and add up to 660:

-1 × 661 = -661
-1 + 661 = 660

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

x² + 660x - 661 = 0

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

(x - 1 ) (x + 661)

To summarize, since -1 and 661 multiply to -661 and add up 660, you know that the following is true:

x² + 660x - 661 = (x - 1 ) (x + 661)

Multiply To One Number and Add Up To Another
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