Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  (122) +  52

Step  2  :

 2.1     12 = 22•3

(12)² = (2²•3)² = 2⁴ • 3²

Equation at the end of step  2  :

  (24•32) +  52

Step  3  :

Final result :

  169