The GCF is $6m^2{n}^2$, and the factored expression is $6m^2{n}^2(2m-3n^2)$.

The GCF is $6m^2{n}^2$, and the factored expression is $6m^2{n}^2(2m-3n^{2}m)$.

The GCF is $6mn$, and the factored expression is $6mn(2m^{2}n-3m{n}^3)$.

The GCF is $3m^2{n}^2$, and the factored expression is $3m^2{n}^2(4m-6n^2)$.