What two numbers multiply to -800 and add up to 20?

Here we answer the question: "What two numbers multiply to -800 and add up to 20?"

The answer to your question is:

-20 and 40

Below we illustrate and prove that -20 and 40 multiply to -800 and add up to 20:

-20 × 40 = -800
-20 + 40 = 20

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

x² + 20x - 800 = 0

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

(x - 20 ) (x + 40)

To summarize, since -20 and 40 multiply to -800 and add up 20, you know that the following is true:

x² + 20x - 800 = (x - 20 ) (x + 40)

Multiply To One Number and Add Up To Another
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