What two numbers multiply to -687 and add up to 686?

Here we answer the question: "What two numbers multiply to -687 and add up to 686?"

The answer to your question is:

-1 and 687

Below we illustrate and prove that -1 and 687 multiply to -687 and add up to 686:

-1 × 687 = -687
-1 + 687 = 686

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

x² + 686x - 687 = 0

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

(x - 1 ) (x + 687)

To summarize, since -1 and 687 multiply to -687 and add up 686, you know that the following is true:

x² + 686x - 687 = (x - 1 ) (x + 687)

Multiply To One Number and Add Up To Another
Did you find the information on this page useful? Here you can solve a similar problem.