What two numbers multiply to -420 and add up to -1?

Here we answer the question: "What two numbers multiply to -420 and add up to -1?"

The answer to your question is:

-21 and 20

Below we illustrate and prove that -21 and 20 multiply to -420 and add up to -1:

-21 × 20 = -420
-21 + 20 = -1

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

x² - 1x - 420 = 0

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

(x - 21 ) (x + 20)

To summarize, since -21 and 20 multiply to -420 and add up -1, you know that the following is true:

x² - 1x - 420 = (x - 21 ) (x + 20)

Multiply To One Number and Add Up To Another
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