Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  (7x2 +  16x) +  4

Step  2  :

Trying to factor by splitting the middle term

 2.1     Factoring  7x²+16x+4 

The first term is,  7x²  its coefficient is  7 .
The middle term is,  +16x  its coefficient is  16 .
The last term, "the constant", is  +4 

Step-1 : Multiply the coefficient of the first term by the constant   7 • 4 = 28 

Step-2 : Find two factors of  28  whose sum equals the coefficient of the middle term, which is   16 .

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above,  2  and  14 
                     7x² + 2x + 14x + 4

Step-4 : Add up the first 2 terms, pulling out like factors :
                    x • (7x+2)
              Add up the last 2 terms, pulling out common factors :
                    2 • (7x+2)
Step-5 : Add up the four terms of step 4 :
                    (x+2)  •  (7x+2)
             Which is the desired factorization

Final result :

  (7x + 2) • (x + 2)