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

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

The answer to your question is:

-644 and -1

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

-644 × -1 = 644
-644 + -1 = -645

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

x² - 645x + 644 = 0

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

(x - 644 ) (x - 1)

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

x² - 645x + 644 = (x - 644 ) (x - 1)

Multiply To One Number and Add Up To Another
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