Solution - Simplification or other simple results

Step  1  :

 1.1     4 = 22

(4)² = (2²)² = 2⁴

Equation at the end of step  1  :

  22 +  ((32) -  24)

Step  2  :

Equation at the end of step  2  :

  22 +  (32 -  24)

Step  3  :

Final result :

  15