Question 486430
{{{(3sqrt(6)-6sqrt(3))(2sqrt(6)+4sqrt(3))=3sqrt(6)*2sqrt(6)+3sqrt(6)*4sqrt(3)-6sqrt(3)*2sqrt(6)-6sqrt(3)*4sqrt(3)=6*6+12sqrt(18)-12sqrt(18)-24*3=36-72=-36}}}
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Or you can use different way
{{{(3sqrt(6)-6sqrt(3))(2sqrt(6)+4sqrt(3))=3(sqrt(6)-2sqrt(3))*2(sqrt(6)+2sqrt(3))=6((sqrt(6))^2-(2sqrt(3))^2)=6(6-4*3)=6*(-6)=-36}}}
Use formula {{{(a-b)(a+b)=a^2-b^2}}}