Question 1082119
Three criteria must be met:
1)  the factors must  multiply to give a -3x^2 terms (all of therm do)
2)  the factors must multiply such that the  xi terms cancel  (NOT all of them do)
3)  the factors must multiply to give -27  (= +27i^2 because i^2 = -1)  (NOT all of them do)

I'll add that A) is NOT correct because {{{ (-3x-3i)(x-9i) = -3x^2 -3xi + 27xi +27i^2 }}}  —> which has a {{{ 24xi}}} term.  



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D:  {{{ (-3x+9i)(x+3i) = -3x^2 - 9xi + 9xi + 27i^2  = -3x^2 - 27 }}}