What two numbers multiply to -639 and add up to -210?

Here we answer the question: "What two numbers multiply to -639 and add up to -210?"

The answer to your question is:

-213 and 3

Below we illustrate and prove that -213 and 3 multiply to -639 and add up to -210:

-213 × 3 = -639
-213 + 3 = -210

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

x² - 210x - 639 = 0

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

(x - 213 ) (x + 3)

To summarize, since -213 and 3 multiply to -639 and add up -210, you know that the following is true:

x² - 210x - 639 = (x - 213 ) (x + 3)

Multiply To One Number and Add Up To Another
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