Here we answer the question: "What two numbers multiply to 990 and add up to 109?"
The answer to your question is:
10 and 99
Below we illustrate and prove that 10 and 99 multiply to 990 and add up to 109:
10 × 99 = 990
10 + 99 = 109
Are you asking because you are trying to figure out how to factor the following quadratic equation?
x2 + 109x + 990 = 0
If so, the solution to factor the quadratic equation above is:
(x + 10 ) (x + 99)
To summarize, since 10 and 99 multiply to 990 and add up 109, you know that the following is true:
x2 + 109x + 990 = (x + 10 ) (x + 99)
Multiply To One Number and Add Up To Another
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