[tex]( \sqrt{360}+2 \sqrt{2}* \sqrt{405})*( \sqrt{810}- \sqrt{20}*\sqrt{162})=(\sqrt{360}+2 \sqrt{810})\\ (\sqrt{810}-\sqrt{3240})=( \sqrt{10*36} +2 \sqrt{10*81})(\sqrt{10*81}- \sqrt{10*4*81})=\\
=(6 \sqrt{10}+18 \sqrt{10})( 9\sqrt{10}-18 \sqrt{10} )=24 \sqrt{10}*(-9\sqrt{10})=-2160[/tex]