[tex]6n^3=\boxed2\cdot3\cdot\boxed{n}\cdot\boxed{n}\cdot n\\\\4n^2=\boxed2\cdot2\cdot\boxed{n}\cdot\boxed{n}\\\\GCF(6n^3,\ 4n^2)=\boxed2\cdot\boxed{n}\cdot\boxed{n}=\boxed{\boxed{2n^2}}[/tex]