What two numbers multiply to -840 and add up to 418?

Here we answer the question: "What two numbers multiply to -840 and add up to 418?"

The answer to your question is:

-2 and 420

Below we illustrate and prove that -2 and 420 multiply to -840 and add up to 418:

-2 × 420 = -840
-2 + 420 = 418

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

x² + 418x - 840 = 0

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

(x - 2 ) (x + 420)

To summarize, since -2 and 420 multiply to -840 and add up 418, you know that the following is true:

x² + 418x - 840 = (x - 2 ) (x + 420)

Multiply To One Number and Add Up To Another
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