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:

-21 and 40

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

-21 × 40 = -840
-21 + 40 = 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 - 21 ) (x + 40)

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

x² + 19x - 840 = (x - 21 ) (x + 40)

Multiply To One Number and Add Up To Another
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