Here we answer the question: "What two numbers multiply to -198 and add up to -7?"
The answer to your question is:
-18 and 11
Below we illustrate and prove that -18 and 11 multiply to -198 and add up to -7:
-18 × 11 = -198
-18 + 11 = -7
Are you asking because you are trying to figure out how to factor the following quadratic equation?
x2 - 7x - 198 = 0
If so, the solution to factor the quadratic equation above is:
(x - 18 ) (x + 11)
To summarize, since -18 and 11 multiply to -198 and add up -7, you know that the following is true:
x2 - 7x - 198 = (x - 18 ) (x + 11)
Multiply To One Number and Add Up To Another
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