Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  (22n2 -  20n) +  25

Step  2  :

Trying to factor by splitting the middle term

 2.1     Factoring  4n²-20n+25 

The first term is,  4n²  its coefficient is  4 .
The middle term is,  -20n  its coefficient is  -20 .
The last term, "the constant", is  +25 

Step-1 : Multiply the coefficient of the first term by the constant   4 • 25 = 100 

Step-2 : Find two factors of  100  whose sum equals the coefficient of the middle term, which is   -20 .

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above,  -10  and  -10 
                     4n² - 10n - 10n - 25

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

Multiplying Exponential Expressions :

 2.2    Multiply  (2n-5)  by  (2n-5) 

The rule says : To multiply exponential expressions which have the same base, add up their exponents.

In our case, the common base is  (2n-5)  and the exponents are :
          1 , as  (2n-5)  is the same number as  (2n-5)¹ 
 and   1 , as  (2n-5)  is the same number as  (2n-5)¹ 
The product is therefore,  (2n-5)⁽¹⁺¹⁾ = (2n-5)² 

Final result :

  (2n - 5)2