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Solution - Linear equations with one unknown

c=root[3]186=5.7083
c=root[3]{186}=5.7083

Step by Step Solution

Rearrange:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                     c^2*c-6-(180)=0 

Step by step solution :

Step  1  :

Trying to factor as a Difference of Cubes:

 1.1      Factoring:  c3-186 

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

Polynomial Roots Calculator :

 1.2    Find roots (zeroes) of :       F(c) = c3-186
Polynomial Roots Calculator is a set of methods aimed at finding values of  c  for which   F(c)=0  

Rational Roots Test is one of the above mentioned tools. It would only find Rational Roots that is numbers  c  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  -186.

 
The factor(s) are:

of the Leading Coefficient :  1
 
of the Trailing Constant :  1 ,2 ,3 ,6 ,31 ,62 ,93 ,186

 
Let us test ....

  P  Q  P/Q  F(P/Q)   Divisor
     -1     1      -1.00      -187.00   
     -2     1      -2.00      -194.00   
     -3     1      -3.00      -213.00   
     -6     1      -6.00      -402.00   
     -31     1     -31.00     -29977.00   
     -62     1     -62.00     -238514.00   
     -93     1     -93.00     -804543.00   
     -186     1     -186.00     -6435042.00   
     1     1      1.00      -185.00   
     2     1      2.00      -178.00   
     3     1      3.00      -159.00   
     6     1      6.00      30.00   
     31     1      31.00     29605.00   
     62     1      62.00     238142.00   
     93     1      93.00     804171.00   
     186     1     186.00     6434670.00   


Polynomial Roots Calculator found no rational roots

Equation at the end of step  1  :

  c3 - 186  = 0 

Step  2  :

Solving a Single Variable Equation :

 2.1      Solve  :    c3-186 = 0 

 
Add  186  to both sides of the equation : 
 
                     c3 = 186
When two things are equal, their cube roots are equal. Taking the cube root of the two sides of the equation we get:  
 
                     c  =  ∛ 186  

 
The equation has one real solution
This solution is  c = ∛186 = 5.7083

One solution was found :

                   c = ∛186 = 5.7083

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