What two numbers multiply to -81 and add up to -80?

Here we answer the question: "What two numbers multiply to -81 and add up to -80?"

The answer to your question is:

-81 and 1

Below we illustrate and prove that -81 and 1 multiply to -81 and add up to -80:

-81 × 1 = -81
-81 + 1 = -80

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

x² - 80x - 81 = 0

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

(x - 81 ) (x + 1)

To summarize, since -81 and 1 multiply to -81 and add up -80, you know that the following is true:

x² - 80x - 81 = (x - 81 ) (x + 1)

Multiply To One Number and Add Up To Another
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