What two numbers multiply to 621 and add up to 78?

Here we answer the question: "What two numbers multiply to 621 and add up to 78?"

The answer to your question is:

9 and 69

Below we illustrate and prove that 9 and 69 multiply to 621 and add up to 78:

9 × 69 = 621
9 + 69 = 78

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

x² + 78x + 621 = 0

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

(x + 9 ) (x + 69)

To summarize, since 9 and 69 multiply to 621 and add up 78, you know that the following is true:

x² + 78x + 621 = (x + 9 ) (x + 69)

Multiply To One Number and Add Up To Another
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