Question 372582
Use the FOIL Method,
{{{(sqrt(3)+1)(5*sqrt(3)+1)=5*sqrt(9)+sqrt(3)+5*sqrt(3)+1}}}
{{{(sqrt(3)+1)(5*sqrt(3)+1)=5*3+1+6*sqrt(3)}}}
{{{(sqrt(3)+1)(5*sqrt(3)+1)=highlight(16+6*sqrt(3))}}}