Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  (2x2 • x) -  28
 Step  2  :
 Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   2x³ - 28  =   2 • (x³ - 14) 

Trying to factor as a Difference of Cubes:

 3.2      Factoring:  x³ - 14 

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 :  14  is not a cube !!
Ruling : Binomial can not be factored as the difference of two perfect cubes

Polynomial Roots Calculator :

 3.3    Find roots (zeroes) of :       F(x) = x³ - 14
Polynomial Roots Calculator is a set of methods aimed at finding values of  x  for which   F(x)=0  

Rational Roots Test is one of the above mentioned tools. It would only find Rational Roots that is numbers  x  which can be expressed as the quotient of two integers

The Rational Root Theorem states that if a polynomial zeroes for a rational number  P/Q   then  P  is a factor of the Trailing Constant and  Q  is a factor of the Leading Coefficient

In this case, the Leading Coefficient is  1  and the Trailing Constant is  -14.

 The factor(s) are:

of the Leading Coefficient :  1
 of the Trailing Constant :  1 ,2 ,7 ,14

 Let us test ....

Polynomial Roots Calculator found no rational roots

Final result :

  2 • (x3 - 14)