Solution - Simplification or other simple results

Step  1  :

Step  2  :

Pulling out like terms :

 2.1    Simplify ( 2a-4b )²

Put the exponent aside and simplfy the base by pulling out like factors :
 2a-4b  =  2 • (a-2b) 

Remember the 4th law of exponents : (a • b)^m= a^m• b^m

Retract the exponent and apply the 4th law to the simplified base: ( 2 • (a-2b) )² =  (2)² • (a-2b)²  

Final result :

  (2)2 • (a - 2b)2