What two numbers multiply to -689 and add up to 688?

Here we answer the question: "What two numbers multiply to -689 and add up to 688?"

The answer to your question is:

-1 and 689

Below we illustrate and prove that -1 and 689 multiply to -689 and add up to 688:

-1 × 689 = -689
-1 + 689 = 688

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

x² + 688x - 689 = 0

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

(x - 1 ) (x + 689)

To summarize, since -1 and 689 multiply to -689 and add up 688, you know that the following is true:

x² + 688x - 689 = (x - 1 ) (x + 689)

Multiply To One Number and Add Up To Another
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