Question 47638
  
   {{{(2-y)/(4+sqrt(y))*(2-y)/(4+sqrt(y))}}} = {{{((2-y)^2)/((4+sqrt(y))^2)}}} = {{{(4-4y+y^2)/(16+8sqrt(y)+y)}}} = {{{(y^2-4y+4)/(y+8sqrt(y)+16)}}} Answer.
  
  Is this clear to you?
  
gsm