Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  (22•52k2) -  25k

Step  2  :

Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   100k² - 25k  =   25k • (4k - 1) 

Final result :

  25k • (4k - 1)