Question 581961
{{{(9-sqrt(5))(3+sqrt(5))}}}



{{{9*3+9*sqrt(5)-3*sqrt(5)-sqrt(5)*sqrt(5)}}}



{{{27+9*sqrt(5)-3*sqrt(5)-sqrt(5*5)}}}



{{{27+9*sqrt(5)-3*sqrt(5)-sqrt(25)}}}



{{{27+9*sqrt(5)-3*sqrt(5)-5}}}



{{{22+6*sqrt(5)}}}



So {{{(9-sqrt(5))(3+sqrt(5))=22+6*sqrt(5)}}}