What two numbers multiply to -816 and add up to 815?

Here we answer the question: "What two numbers multiply to -816 and add up to 815?"

The answer to your question is:

-1 and 816

Below we illustrate and prove that -1 and 816 multiply to -816 and add up to 815:

-1 × 816 = -816
-1 + 816 = 815

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

x² + 815x - 816 = 0

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

(x - 1 ) (x + 816)

To summarize, since -1 and 816 multiply to -816 and add up 815, you know that the following is true:

x² + 815x - 816 = (x - 1 ) (x + 816)

Multiply To One Number and Add Up To Another
Did you find the information on this page useful? Here you can solve a similar problem.