Question 673233
a) {{{2*sqrt(12) + sqrt(27) = 2*sqrt(4*3) + sqrt(9*3) = 2*sqrt(4)*sqrt(3) + sqrt(9)*sqrt(3) = 2*2*sqrt(3) + 3*sqrt(3) = 4*sqrt(3) + 3*sqrt(3) = 7*sqrt(3)}}}
  
b) {{{4*sqrt(3) - 6*sqrt(75) = 4*sqrt(3) - 6*sqrt(25*3) = 4*sqrt(3) - 6*sqrt(25)*sqrt(3) = 4*sqrt(3) - 6*5*sqrt(3) = 4*sqrt(3) - 30*sqrt(3) = -26*sqrt(3)}}}