What two numbers multiply to -80 and add up to 16?

Here we answer the question: "What two numbers multiply to -80 and add up to 16?"

The answer to your question is:

-4 and 20

Below we illustrate and prove that -4 and 20 multiply to -80 and add up to 16:

-4 × 20 = -80
-4 + 20 = 16

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

x² + 16x - 80 = 0

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

(x - 4 ) (x + 20)

To summarize, since -4 and 20 multiply to -80 and add up 16, you know that the following is true:

x² + 16x - 80 = (x - 4 ) (x + 20)

Multiply To One Number and Add Up To Another
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