What two numbers multiply to 398 and add up to 399?

Here we answer the question: "What two numbers multiply to 398 and add up to 399?"

The answer to your question is:

1 and 398

Below we illustrate and prove that 1 and 398 multiply to 398 and add up to 399:

1 × 398 = 398
1 + 398 = 399

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

x² + 399x + 398 = 0

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

(x + 1 ) (x + 398)

To summarize, since 1 and 398 multiply to 398 and add up 399, you know that the following is true:

x² + 399x + 398 = (x + 1 ) (x + 398)

Multiply To One Number and Add Up To Another
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