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

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

The answer to your question is:

1 and 420

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

1 × 420 = 420
1 + 420 = 421

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

x² + 421x + 420 = 0

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

(x + 1 ) (x + 420)

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

x² + 421x + 420 = (x + 1 ) (x + 420)

Multiply To One Number and Add Up To Another
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