9x^4+12x^3+28x^2+(9m+7n)x+7n+9m
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Step-by-step explanation:
= 9x^4 + 12x^3 + 28x^2 + 9mx + 7nx + 7n + 9m
= 9x^4 + 12x^3 + 9mx + 28x^2 + 7nx + 7n + 9m
= 3(3x^4 + 4x^3 + 3mx+ 3m) + 7(4x^2 +nx+n)
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