21Q^3 x 7Q^4 x (3Q)^2

1323Q^9………….

21q³.7q^4.(3q)² = 21q³.7q^4. (3²)(q²) = 21q³.7q^4.9.q² = 21q³.7q^4.9q² = (21.7.9)q³+^4+² = 1323^9