What two numbers multiply to -688 and add up to -78?

Here we answer the question: "What two numbers multiply to -688 and add up to -78?"

The answer to your question is:

-86 and 8

Below we illustrate and prove that -86 and 8 multiply to -688 and add up to -78:

-86 × 8 = -688
-86 + 8 = -78

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

x² - 78x - 688 = 0

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

(x - 86 ) (x + 8)

To summarize, since -86 and 8 multiply to -688 and add up -78, you know that the following is true:

x² - 78x - 688 = (x - 86 ) (x + 8)

Multiply To One Number and Add Up To Another
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