Here we answer the question: "What two numbers multiply to -880 and add up to -78?"
The answer to your question is:
-88 and 10
Below we illustrate and prove that -88 and 10 multiply to -880 and add up to -78:
-88 × 10 = -880
-88 + 10 = -78
Are you asking because you are trying to figure out how to factor the following quadratic equation?
x2 - 78x - 880 = 0
If so, the solution to factor the quadratic equation above is:
(x - 88 ) (x + 10)
To summarize, since -88 and 10 multiply to -880 and add up -78, you know that the following is true:
x2 - 78x - 880 = (x - 88 ) (x + 10)
Multiply To One Number and Add Up To Another
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