Solution - Simplification or other simple results

Step  1  :

 1.1     4 = 22

(4)² = (2²)² = 2⁴

Equation at the end of step  1  :

  (9 • 24) +  12

Step  2  :

Equation at the end of step  2  :

  (32•24) +  12

Step  3  :

Final result :

  156