Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "a2"   was replaced by   "a^2". 

Step  1  :

Equation at the end of step  1  :

  (9 • (a2)) -  (2•3•5a25)
 Step  2  :

Equation at the end of step  2  :

  32a2 -  (2•3•5a25)

Step  3  :

Step  4  :

Pulling out like terms :

 4.1     Pull out like factors :

   9a² - 30a²⁵  =   -3a² • (10a²³ - 3) 

Final result :

  -3a2 • (10a23 - 3)