Solution - Simplification or other simple results

Step  1  :

 1.1     4 = 22

(4)⁴ = (2²)⁴ = 2⁸

Equation at the end of step  1  :

  (43) +  28

Step  2  :

 2.1     4 = 22

(4)³ = (2²)³ = 2⁶

Equation at the end of step  2  :

  26 +  28

Step  3  :

Final result :

  320