Solution - Simplification or other simple results

Step  1  :

 1.1     14 = 2•7

(14)² = (2•7)² = 2² • 7²

Equation at the end of step  1  :

  (182) -  (22•72)

Step  2  :

 2.1     18 = 2•32

(18)² = (2•3²)² = 2² • 3⁴

Equation at the end of step  2  :

  (22•34) -  (22•72)

Step  3  :

Final result :

  128