What two numbers multiply to -644 and add up to 643?

Here we answer the question: "What two numbers multiply to -644 and add up to 643?"

The answer to your question is:

-1 and 644

Below we illustrate and prove that -1 and 644 multiply to -644 and add up to 643:

-1 × 644 = -644
-1 + 644 = 643

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

x² + 643x - 644 = 0

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

(x - 1 ) (x + 644)

To summarize, since -1 and 644 multiply to -644 and add up 643, you know that the following is true:

x² + 643x - 644 = (x - 1 ) (x + 644)

Multiply To One Number and Add Up To Another
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