Solution - Simplification or other simple results

Step  1  :

 1.1     9 = 32

(9)² = (3²)² = 3⁴

Equation at the end of step  1  :

  (122) -  34

Step  2  :

 2.1     12 = 22•3

(12)² = (2²•3)² = 2⁴ • 3²

Equation at the end of step  2  :

  (24•32) -  34

Step  3  :

Final result :

  63