What two numbers multiply to -406 and add up to -405?

Here we answer the question: "What two numbers multiply to -406 and add up to -405?"

The answer to your question is:

-406 and 1

Below we illustrate and prove that -406 and 1 multiply to -406 and add up to -405:

-406 × 1 = -406
-406 + 1 = -405

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

x² - 405x - 406 = 0

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

(x - 406 ) (x + 1)

To summarize, since -406 and 1 multiply to -406 and add up -405, you know that the following is true:

x² - 405x - 406 = (x - 406 ) (x + 1)

Multiply To One Number and Add Up To Another
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