What two numbers multiply to -729 and add up to -72?

Here we answer the question: "What two numbers multiply to -729 and add up to -72?"

The answer to your question is:

-81 and 9

Below we illustrate and prove that -81 and 9 multiply to -729 and add up to -72:

-81 × 9 = -729
-81 + 9 = -72

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

x² - 72x - 729 = 0

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

(x - 81 ) (x + 9)

To summarize, since -81 and 9 multiply to -729 and add up -72, you know that the following is true:

x² - 72x - 729 = (x - 81 ) (x + 9)

Multiply To One Number and Add Up To Another
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