its the same as root 6(4+2-1) =root 6(5) =5root6 =A i hope i helped today..

[latex]4 \sqrt{6} + 2 \sqrt{6} - \sqrt{6} \\ \\ 5 \sqrt{6} \ / \ simplify \\ \\ [/latex] The final result is: 5√6 or 12.2474.