Break  down into primes factors:



Break  down into prime factors:



Substitute these prime factorizations 
under the radical:



Use parentheses to group all pairs of like factors:  

(We group by twos since it is a square root; 
if it were a cube root we would group by threes)



The  is equivalent to  so we
take out only a single  out in front of the
radical:



 The  is equivalent to  so we
take out only a single  out in front of the
radical:





Edwin