Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  (0 -  22x2) +  4000x

Step  2  :

Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   4000x - 4x²  =   -4x • (x - 1000) 

Final result :

  -4x • (x - 1000)