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Solution - Simplification or other simple results

3x310
3x^3-10

Step by Step Solution

Step  1  :

Equation at the end of step  1  :

  (3x2 • x) -  10

Step  2  :

Trying to factor as a Difference of Cubes:

 2.1      Factoring:  3x3-10 

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 :  3  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) = 3x3-10
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  3  and the Trailing Constant is  -10.

 
The factor(s) are:

of the Leading Coefficient :  1,3
 
of the Trailing Constant :  1 ,2 ,5 ,10

 
Let us test ....

  P  Q  P/Q  F(P/Q)   Divisor
     -1     1      -1.00      -13.00   
     -1     3      -0.33      -10.11   
     -2     1      -2.00      -34.00   
     -2     3      -0.67      -10.89   
     -5     1      -5.00      -385.00   
     -5     3      -1.67      -23.89   
     -10     1     -10.00     -3010.00   
     -10     3      -3.33      -121.11   
     1     1      1.00      -7.00   
     1     3      0.33      -9.89   
     2     1      2.00      14.00   
     2     3      0.67      -9.11   
     5     1      5.00      365.00   
     5     3      1.67      3.89   
     10     1      10.00      2990.00   
     10     3      3.33      101.11   


Polynomial Roots Calculator found no rational roots

Final result :

  3x3 - 10

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