Answer:
[tex]=7\sqrt[]{3m^3n^{3.}}[/tex]Step by step explanation:
We cannot solve nonperfect exponents in a square radical, we can only simplify the 147 radical:
[tex]\begin{gathered} =\sqrt[]{147m^3n^3} \\ =\sqrt[]{49\cdot3m^3n^3} \\ =7\sqrt[]{3m^3n^{3.}} \end{gathered}[/tex]