What two numbers multiply to -816 and add up to 406?

Here we answer the question: "What two numbers multiply to -816 and add up to 406?"

The answer to your question is:

-2 and 408

Below we illustrate and prove that -2 and 408 multiply to -816 and add up to 406:

-2 × 408 = -816
-2 + 408 = 406

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

x² + 406x - 816 = 0

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

(x - 2 ) (x + 408)

To summarize, since -2 and 408 multiply to -816 and add up 406, you know that the following is true:

x² + 406x - 816 = (x - 2 ) (x + 408)

Multiply To One Number and Add Up To Another
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