Question 295830
{{{(5*sqrt(3)+7)*(-2*sqrt(3)-3*sqrt(7))}}}
= {{{5*sqrt(3)*(-2)*sqrt(3) + 5*sqrt(3)*(-3)*sqrt(7)+7*(-2)*sqrt(3) + 7*(-3)*sqrt(7)}}}
= {{{-10*3 + (-15)*sqrt(21)+(-14)*sqrt(3) + (-21)*sqrt(7)}}}
= {{{-30 - 15*sqrt(21) - 14*sqrt(3) - 21*sqrt(7)}}}