Question 673234
a) {{{sqrt(3)*sqrt(15) = sqrt(3*15) = sqrt(45) = sqrt(9*5) = sqrt(9)*sqrt(5) = 3*sqrt(5)}}}
  
b) {{{sqrt(8)*sqrt(12) = sqrt(8*12) = sqrt(96) = sqrt(16*6) = sqrt(16)*sqrt(6) = 4*sqrt(6)}}}