What two numbers multiply to -840 and add up to -19?

Here we answer the question: "What two numbers multiply to -840 and add up to -19?"

The answer to your question is:

-40 and 21

Below we illustrate and prove that -40 and 21 multiply to -840 and add up to -19:

-40 × 21 = -840
-40 + 21 = -19

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

x² - 19x - 840 = 0

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

(x - 40 ) (x + 21)

To summarize, since -40 and 21 multiply to -840 and add up -19, you know that the following is true:

x² - 19x - 840 = (x - 40 ) (x + 21)

Multiply To One Number and Add Up To Another
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