You can put this solution on YOUR website! All three terms show addition operation, and no negative sign nor subtraction found. Arrange as . One obvious binomial factor combination is.
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Can you think of any other combination? You want the leading terms of each binomial to give product of , and you want the constant terms of the binomials to have product of 1. You want to check to see that the resulting terms of a will sum to 3a. Certainly they do.