What two numbers multiply to -421 and add up to 420?

Here we answer the question: "What two numbers multiply to -421 and add up to 420?"

The answer to your question is:

-1 and 421

Below we illustrate and prove that -1 and 421 multiply to -421 and add up to 420:

-1 × 421 = -421
-1 + 421 = 420

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

x² + 420x - 421 = 0

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

(x - 1 ) (x + 421)

To summarize, since -1 and 421 multiply to -421 and add up 420, you know that the following is true:

x² + 420x - 421 = (x - 1 ) (x + 421)

Multiply To One Number and Add Up To Another
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