9p^2+mn^2+9m+p^2n^2
look at pairs of terms and see if the same common factor is found in "pairs" 9p^2+mn^2+9m+p^2n^2 =9p^2 + p^2n^2 + mn^2 + 9m = p^2(9 + n^2) + m(n^2 + 9) = (n^2 + 9)(p^2 + m)
You can ask a new question or answer this question.