Question 59689
  
  {{{sqrt(75a^2)/(sqrt(5))}}} = {{{sqrt(5)*sqrt(15a^2)/sqrt(5)}}} = {{{sqrt(5)*a*sqrt(15)/sqrt(5)}}} = {{{cross(sqrt(5))*a*sqrt(15)/cross(sqrt(5))}}} = {{{a*sqrt(15)}}} Answer.
 
  I hope this is clear to you.