What two numbers multiply to -80 and add up to 79?

Here we answer the question: "What two numbers multiply to -80 and add up to 79?"

The answer to your question is:

-1 and 80

Below we illustrate and prove that -1 and 80 multiply to -80 and add up to 79:

-1 × 80 = -80
-1 + 80 = 79

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

x² + 79x - 80 = 0

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

(x - 1 ) (x + 80)

To summarize, since -1 and 80 multiply to -80 and add up 79, you know that the following is true:

x² + 79x - 80 = (x - 1 ) (x + 80)

Multiply To One Number and Add Up To Another
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