What two numbers multiply to 405 and add up to 86?

Here we answer the question: "What two numbers multiply to 405 and add up to 86?"

The answer to your question is:

5 and 81

Below we illustrate and prove that 5 and 81 multiply to 405 and add up to 86:

5 × 81 = 405
5 + 81 = 86

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

x² + 86x + 405 = 0

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

(x + 5 ) (x + 81)

To summarize, since 5 and 81 multiply to 405 and add up 86, you know that the following is true:

x² + 86x + 405 = (x + 5 ) (x + 81)

Multiply To One Number and Add Up To Another
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