Question 352223
{{{(3*sqrt(2)- 9*sqrt(6))(5*sqrt(2) + 15*sqrt(6))=15*2+45*sqrt(12)-45*sqrt(12)-135*6}}}
{{{(3*sqrt(2)- 9*sqrt(6))(5*sqrt(2) + 15*sqrt(6))=30-810}}}
{{{(3*sqrt(2)- 9*sqrt(6))(5*sqrt(2) + 15*sqrt(6))=highlight(-780)}}}