What two numbers multiply to 990 and add up to 81?

Here we answer the question: "What two numbers multiply to 990 and add up to 81?"

The answer to your question is:

15 and 66

Below we illustrate and prove that 15 and 66 multiply to 990 and add up to 81:

15 × 66 = 990
15 + 66 = 81

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

x² + 81x + 990 = 0

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

(x + 15 ) (x + 66)

To summarize, since 15 and 66 multiply to 990 and add up 81, you know that the following is true:

x² + 81x + 990 = (x + 15 ) (x + 66)

Multiply To One Number and Add Up To Another
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