Question 1068110
Use the FOIL method,
{{{(-2+sqrt(3))(-5+2sqrt(3))=10-4sqrt(3)-5sqrt(3)+2(3))}}}
{{{(-2+sqrt(3))(-5+2sqrt(3))=(10+6)-9sqrt(3)}}}
{{{(-2+sqrt(3))(-5+2sqrt(3))=16-9sqrt(3)}}}