What two numbers multiply to -720 and add up to -71?

Here we answer the question: "What two numbers multiply to -720 and add up to -71?"

The answer to your question is:

-80 and 9

Below we illustrate and prove that -80 and 9 multiply to -720 and add up to -71:

-80 × 9 = -720
-80 + 9 = -71

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

x² - 71x - 720 = 0

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

(x - 80 ) (x + 9)

To summarize, since -80 and 9 multiply to -720 and add up -71, you know that the following is true:

x² - 71x - 720 = (x - 80 ) (x + 9)

Multiply To One Number and Add Up To Another
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