Solution - Simplification or other simple results

Step  1  :

Trying to factor by splitting the middle term

 1.1     Factoring  n²-n-56 

The first term is,  n²  its coefficient is  1 .
The middle term is,  -n  its coefficient is  -1 .
The last term, "the constant", is  -56 

Step-1 : Multiply the coefficient of the first term by the constant   1 • -56 = -56 

Step-2 : Find two factors of  -56  whose sum equals the coefficient of the middle term, which is   -1 .

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above,  -8  and  7 
                     n² - 8n + 7n - 56

Step-4 : Add up the first 2 terms, pulling out like factors :
                    n • (n-8)
              Add up the last 2 terms, pulling out common factors :
                    7 • (n-8)
Step-5 : Add up the four terms of step 4 :
                    (n+7)  •  (n-8)
             Which is the desired factorization

Final result :

  (n + 7) • (n - 8)