What two numbers multiply to -691 and add up to 690?

Here we answer the question: "What two numbers multiply to -691 and add up to 690?"

The answer to your question is:

-1 and 691

Below we illustrate and prove that -1 and 691 multiply to -691 and add up to 690:

-1 × 691 = -691
-1 + 691 = 690

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

x² + 690x - 691 = 0

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

(x - 1 ) (x + 691)

To summarize, since -1 and 691 multiply to -691 and add up 690, you know that the following is true:

x² + 690x - 691 = (x - 1 ) (x + 691)

Multiply To One Number and Add Up To Another
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