What two numbers multiply to -243 and add up to -78?

Here we answer the question: "What two numbers multiply to -243 and add up to -78?"

The answer to your question is:

-81 and 3

Below we illustrate and prove that -81 and 3 multiply to -243 and add up to -78:

-81 × 3 = -243
-81 + 3 = -78

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

x² - 78x - 243 = 0

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

(x - 81 ) (x + 3)

To summarize, since -81 and 3 multiply to -243 and add up -78, you know that the following is true:

x² - 78x - 243 = (x - 81 ) (x + 3)

Multiply To One Number and Add Up To Another
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