Question 319032
Use the FOIL method:
First:{{{( highlight( sqrt(3) ) + x )( highlight( sqrt(3) ) - x ) = sqrt(3)sqrt(3)=3}}}
Outer:{{{( highlight( sqrt(3) ) + x )(  sqrt(3)  - highlight(x) )=sqrt(3)(-x)=-sqrt(3)x}}}
Inner:{{{(  sqrt(3)  + highlight(x) )( highlight( sqrt(3) ) - x )=(x)sqrt(3)=sqrt(3)x}}}
Last:{{{(sqrt(3) + highlight( x) )(sqrt(3) - highlight( x) )=x(-x)=-x^2 }}}
Add it all together,
{{{(sqrt(3)+x)(sqrt(3)-x)=3-sqrt(3)x+sqrt(3)x-x^2}}}
{{{(sqrt(3)+x)(sqrt(3)-x) =highlight_green( 3-x^2)}}}