What two numbers multiply to -666 and add up to 665?

Here we answer the question: "What two numbers multiply to -666 and add up to 665?"

The answer to your question is:

-1 and 666

Below we illustrate and prove that -1 and 666 multiply to -666 and add up to 665:

-1 × 666 = -666
-1 + 666 = 665

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

x² + 665x - 666 = 0

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

(x - 1 ) (x + 666)

To summarize, since -1 and 666 multiply to -666 and add up 665, you know that the following is true:

x² + 665x - 666 = (x - 1 ) (x + 666)

Multiply To One Number and Add Up To Another
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