Rationalize the denominator of  
          (i) (ii)  (iii)  

(i) The denominator is a trinomial surd.  
      We proceed as with a binomial surd by grouping two of the terms. Thus, 
           
                            
                               = 9 + 6 √5 + 5 - 8
                               = 6 + 6 √5
                               = 6(1+ √5)
                            
    \\   
  


=
 =
=
 (ii) The denominator is a trinomial surd.  
     We proceed as with a binomial surd by grouping two of the terms. 
    Thus, 
= 3 –  


=    
                                             
 (iii) The denominator is a trinomial surd.  
       We proceed as with a trinomial surd, by grouping two of the terms.
   Thus,