What two numbers multiply to -820 and add up to 21?

Here we answer the question: "What two numbers multiply to -820 and add up to 21?"

The answer to your question is:

-20 and 41

Below we illustrate and prove that -20 and 41 multiply to -820 and add up to 21:

-20 × 41 = -820
-20 + 41 = 21

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

x² + 21x - 820 = 0

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

(x - 20 ) (x + 41)

To summarize, since -20 and 41 multiply to -820 and add up 21, you know that the following is true:

x² + 21x - 820 = (x - 20 ) (x + 41)

Multiply To One Number and Add Up To Another
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