What two numbers multiply to -647 and add up to -646?

Here we answer the question: "What two numbers multiply to -647 and add up to -646?"

The answer to your question is:

-647 and 1

Below we illustrate and prove that -647 and 1 multiply to -647 and add up to -646:

-647 × 1 = -647
-647 + 1 = -646

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

x² - 646x - 647 = 0

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

(x - 647 ) (x + 1)

To summarize, since -647 and 1 multiply to -647 and add up -646, you know that the following is true:

x² - 646x - 647 = (x - 647 ) (x + 1)

Multiply To One Number and Add Up To Another
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