You have to find two numbers whose sum is -18, and whose product is 3. Experimenting with different combinations of factors for 18, you find that this is 6 and -3, so the factors are (x+6)(x-3).
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(3x+1)(x+2)
(2x + 7)(x - 2)
(x + 1)(x - 4)
Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "times". There is no trinomial in the question.
3(x2 + 3x + 1)