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:

-9 and 80

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

-9 × 80 = -720
-9 + 80 = 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 - 9 ) (x + 80)

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

x² + 71x - 720 = (x - 9 ) (x + 80)

Multiply To One Number and Add Up To Another
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