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:

-689 and 1

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

-689 × 1 = -689
-689 + 1 = -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 - 689 ) (x + 1)

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

x² - 688x - 689 = (x - 689 ) (x + 1)

Multiply To One Number and Add Up To Another
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