Question 838646

Use the FOIL method,
{{{(sqrt(3)-1) (sqrt(3)+1)=sqrt(3)sqrt(3)+1*sqrt(3)-1*sqrt(3)-1}}}

{{{(sqrt(3)-1) (sqrt(3)+1)=3-1}}}
{{{(sqrt(3)-1) (sqrt(3)+1)=highlight(2)}}}