Solution - Simplification or other simple results

Step  1  :

Trying to factor as a Difference of Cubes:

 1.1      Factoring:  x³-64 

Theory : A difference of two perfect cubes,  a³ - b³ can be factored into
              (a-b) • (a² +ab +b²)

Proof :  (a-b)•(a²+ab+b²) =
            a³+a²b+ab²-ba²-b²a-b³ =
            a³+(a²b-ba²)+(ab²-b²a)-b³ =
            a³+0+0-b³ =
            a³-b³

Check :  64  is the cube of   4 
Check :  x³ is the cube of   x¹

Factorization is :
             (x - 4)  •  (x² + 4x + 16) 

Trying to factor by splitting the middle term

 1.2     Factoring  x² + 4x + 16 

The first term is,  x²  its coefficient is  1 .
The middle term is,  +4x  its coefficient is  4 .
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   4 .

Observation : No two such factors can be found !!
Conclusion : Trinomial can not be factored

Final result :

  (x - 4) • (x2 + 4x + 16)