Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  7x2 +  28x

Step  2  :

Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   7x² + 28x  =   7x • (x + 4) 

Final result :

  7x • (x + 4)