Question 840975
Use the FOIL Method,
{{{ (5+sqrt(3))(2-sqrt(3))=5*2+5(-sqrt(3))+sqrt(3)*(2)+sqrt(3)(-sqrt(3)) }}}
{{{ (5+sqrt(3))(2-sqrt(3))=10-5*sqrt(3)+2*sqrt(3)-3 }}}
{{{ (5+sqrt(3))(2-sqrt(3))=7-3*sqrt(3) }}}