Polynomial factors from sum of polynomials with known factors

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Say I know the linear factors of polynomials A and B. For instance, if they were cubic I could express them as A(x) = (ax + b)(cx + d)(ex + f) and B(x) = (gx + h)(ix + j)(kx + l). Are there any circumstances under which I can take advantage of knowing these original factors if I want to compute the linear factors of the polynomial A + B?