What two numbers multiply to 810 and add up to 99?

Here we answer the question: "What two numbers multiply to 810 and add up to 99?"

The answer to your question is:

9 and 90

Below we illustrate and prove that 9 and 90 multiply to 810 and add up to 99:

9 × 90 = 810
9 + 90 = 99

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

x² + 99x + 810 = 0

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

(x + 9 ) (x + 90)

To summarize, since 9 and 90 multiply to 810 and add up 99, you know that the following is true:

x² + 99x + 810 = (x + 9 ) (x + 90)

Multiply To One Number and Add Up To Another
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