Here we answer the question: "What two numbers multiply to -990 and add up to 89?"
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 89:
-10 × 99 = -990
-10 + 99 = 89
Are you asking because you are trying to figure out how to factor the following quadratic equation?
x2 + 89x - 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 89, you know that the following is true:
x2 + 89x - 990 = (x - 10 ) (x + 99)
Multiply To One Number and Add Up To Another
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