What two numbers multiply to 729 and add up to 90?

Here we answer the question: "What two numbers multiply to 729 and add up to 90?"

The answer to your question is:

9 and 81

Below we illustrate and prove that 9 and 81 multiply to 729 and add up to 90:

9 × 81 = 729
9 + 81 = 90

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

x² + 90x + 729 = 0

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

(x + 9 ) (x + 81)

To summarize, since 9 and 81 multiply to 729 and add up 90, you know that the following is true:

x² + 90x + 729 = (x + 9 ) (x + 81)

Multiply To One Number and Add Up To Another
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