What two numbers multiply to -645 and add up to -644?

Here we answer the question: "What two numbers multiply to -645 and add up to -644?"

The answer to your question is:

-645 and 1

Below we illustrate and prove that -645 and 1 multiply to -645 and add up to -644:

-645 × 1 = -645
-645 + 1 = -644

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

x² - 644x - 645 = 0

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

(x - 645 ) (x + 1)

To summarize, since -645 and 1 multiply to -645 and add up -644, you know that the following is true:

x² - 644x - 645 = (x - 645 ) (x + 1)

Multiply To One Number and Add Up To Another
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