Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  (22x2 -  40x) +  64

Step  2  :

Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   4x² - 40x + 64  =   4 • (x² - 10x + 16) 

Trying to factor by splitting the middle term

 3.2     Factoring  x² - 10x + 16 

The first term is,  x²  its coefficient is  1 .
The middle term is,  -10x  its coefficient is  -10 .
The last term, "the constant", is  +16 

Step-1 : Multiply the coefficient of the first term by the constant   1 • 16 = 16 

Step-2 : Find two factors of  16  whose sum equals the coefficient of the middle term, which is   -10 .

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above,  -8  and  -2 
                     x² - 8x - 2x - 16

Step-4 : Add up the first 2 terms, pulling out like factors :
                    x • (x-8)
              Add up the last 2 terms, pulling out common factors :
                    2 • (x-8)
Step-5 : Add up the four terms of step 4 :
                    (x-2)  •  (x-8)
             Which is the desired factorization

Final result :

  4 • (x - 2) • (x - 8)