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Solution - Simplification or other simple results

6x37
6x^3-7

Step by Step Solution

Step  1  :

Equation at the end of step  1  :

  ((2•3x2) • x) -  7

Step  2  :

Trying to factor as a Difference of Cubes:

 2.1      Factoring:  6x3-7 

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 :  6  is not a cube !!

Ruling : Binomial can not be factored as the difference of two perfect cubes

Polynomial Roots Calculator :

 2.2    Find roots (zeroes) of :       F(x) = 6x3-7
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  6  and the Trailing Constant is  -7.

 
The factor(s) are:

of the Leading Coefficient :  1,2 ,3 ,6
 
of the Trailing Constant :  1 ,7

 
Let us test ....

  P  Q  P/Q  F(P/Q)   Divisor
     -1     1      -1.00      -13.00   
     -1     2      -0.50      -7.75   
     -1     3      -0.33      -7.22   
     -1     6      -0.17      -7.03   
     -7     1      -7.00     -2065.00   
     -7     2      -3.50      -264.25   
     -7     3      -2.33      -83.22   
     -7     6      -1.17      -16.53   
     1     1      1.00      -1.00   
     1     2      0.50      -6.25   
     1     3      0.33      -6.78   
     1     6      0.17      -6.97   
     7     1      7.00      2051.00   
     7     2      3.50      250.25   
     7     3      2.33      69.22   
     7     6      1.17      2.53   


Polynomial Roots Calculator found no rational roots

Final result :

  6x3 - 7

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