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(6x/(x-2))-√(12x/(x-2))-(12x/(x-2))^1/4>0 desigualdades

En la desigualdad la incógnita

Solución

Ha introducido [src]
            _______       _______    
 6*x       /  12*x       /  12*x     
----- -   /  -----  - 4 /  -----  > 0
x - 2   \/   x - 2    \/   x - 2     
$$- \sqrt[4]{\frac{12 x}{x - 2}} + \left(\frac{6 x}{x - 2} - \sqrt{\frac{12 x}{x - 2}}\right) > 0$$
-((12*x)/(x - 2))^(1/4) + (6*x)/(x - 2) - sqrt((12*x)/(x - 2)) > 0
Solución detallada
Se da la desigualdad:
$$- \sqrt[4]{\frac{12 x}{x - 2}} + \left(\frac{6 x}{x - 2} - \sqrt{\frac{12 x}{x - 2}}\right) > 0$$
Para resolver esta desigualdad primero hay que resolver la ecuación correspondiente:
$$- \sqrt[4]{\frac{12 x}{x - 2}} + \left(\frac{6 x}{x - 2} - \sqrt{\frac{12 x}{x - 2}}\right) = 0$$
Resolvemos:
$$x_{1} = 0$$
$$x_{2} = \frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}$$
$$x_{1} = 0$$
$$x_{2} = \frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}$$
Las raíces dadas
$$x_{2} = \frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}$$
$$x_{1} = 0$$
son puntos de cambio del signo de desigualdad en las soluciones.
Primero definámonos con el signo hasta el punto extremo izquierdo:
$$x_{0} < x_{2}$$
Consideremos, por ejemplo, el punto
$$x_{0} = x_{2} - \frac{1}{10}$$
=
$$\frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}} + - \frac{1}{10}$$
=
$$\frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}} - \frac{1}{10}$$
lo sustituimos en la expresión
$$- \sqrt[4]{\frac{12 x}{x - 2}} + \left(\frac{6 x}{x - 2} - \sqrt{\frac{12 x}{x - 2}}\right) > 0$$
$$- \sqrt[4]{\frac{12 \left(\frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}} - \frac{1}{10}\right)}{\left(\frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}} - \frac{1}{10}\right) - 2}} + \left(- \sqrt{\frac{12 \left(\frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}} - \frac{1}{10}\right)}{\left(\frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}} - \frac{1}{10}\right) - 2}} + \frac{6 \left(\frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}} - \frac{1}{10}\right)}{\left(\frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}} - \frac{1}{10}\right) - 2}\right) > 0$$
                                                                                 4                                                                                                                                                                                                                                                                                                                                                                                                                                                            
          /     ___________________________                                     \                                                                                                                                                                                                                                                                                                                                                                                                                                                             
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          |   /  \/ 2 *\/ 3    3   *\/ 38                   \/ 3                |                                                                                                                                                                                                                                                                                                                                                                                                                                                             
       12*|3 /   ----------- + -----------  + ----------------------------------|                                                                                                                                                                                                                                                                                                                                                                                                                                                             
          |\/         12           108               ___________________________|                                                                                                                                                                                                                                                                                                                                                                                                                                                             
          |                                         /   ___ 4 ___    3/4   ____ |                                                                                                                                                                                                                                                                                                                                                                                                                                                             
          |                                        /  \/ 2 *\/ 3    3   *\/ 38  |                                                                                                                                                                                                                                                                                                                                                                                                                                                             
          |                                   9*3 /   ----------- + ----------- |                                                                                                                                                                                                                                                                                                                                                                                                                                                             
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- - + -----------------------------------------------------------------------------                                                                                                                                         ___________________________________________________________________________________                                                                                                                                        ___________________________________________________________________________________    
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           |   /  \/ 2 *\/ 3    3   *\/ 38                   \/ 3                |                                                                                                                                      /            |   /  \/ 2 *\/ 3    3   *\/ 38                   \/ 3                |                                                                                                                                       /            |   /  \/ 2 *\/ 3    3   *\/ 38                   \/ 3                |       
      -1 + |3 /   ----------- + -----------  + ----------------------------------|                                                                                                                                     /          24*|3 /   ----------- + -----------  + ----------------------------------|                                                                                                                                      /          24*|3 /   ----------- + -----------  + ----------------------------------|       
           |\/         12           108               ___________________________|                                                                                                                                    /              |\/         12           108               ___________________________|                                                                                                                                     /              |\/         12           108               ___________________________|       
           |                                         /   ___ 4 ___    3/4   ____ |                                                                                                                                   /               |                                         /   ___ 4 ___    3/4   ____ |                                                                                                                                    /               |                                         /   ___ 4 ___    3/4   ____ |       
           |                                        /  \/ 2 *\/ 3    3   *\/ 38  |                                                                                                                                  /                |                                        /  \/ 2 *\/ 3    3   *\/ 38  |                                                                                                                                   /                |                                        /  \/ 2 *\/ 3    3   *\/ 38  |       
           |                                   9*3 /   ----------- + ----------- |                             ______________________________________________________________________________________              /                 |                                   9*3 /   ----------- + ----------- |                              ______________________________________________________________________________________              /                 |                                   9*3 /   ----------- + ----------- |       
           \                                     \/         12           108     /                            /                                         -1                                                        /          6       \                                     \/         12           108     /                             /                                         -1                                                        /          6       \                                     \/         12           108     /       
------------------------------------------------------------------------------------ -                       /  ------------------------------------------------------------------------------------ *           /           - - -----------------------------------------------------------------------------  -                       /  ------------------------------------------------------------------------------------ *           /           - - -----------------------------------------------------------------------------  > 0
                                                                                  4                         /                                                                                     4             /            5                                                                               4                         /                                                                                     4             /            5                                                                               4     
           /     ___________________________                                     \                         /               /     ___________________________                                     \             /                      /     ___________________________                                     \                         /               /     ___________________________                                     \             /                      /     ___________________________                                     \      
           |    /   ___ 4 ___    3/4   ____                    ___               |                        /                |    /   ___ 4 ___    3/4   ____                    ___               |            /                       |    /   ___ 4 ___    3/4   ____                    ___               |                        /                |    /   ___ 4 ___    3/4   ____                    ___               |            /                       |    /   ___ 4 ___    3/4   ____                    ___               |      
           |   /  \/ 2 *\/ 3    3   *\/ 38                   \/ 3                |                       /                 |   /  \/ 2 *\/ 3    3   *\/ 38                   \/ 3                |           /                        |   /  \/ 2 *\/ 3    3   *\/ 38                   \/ 3                |                       /                 |   /  \/ 2 *\/ 3    3   *\/ 38                   \/ 3                |           /                        |   /  \/ 2 *\/ 3    3   *\/ 38                   \/ 3                |      
         2*|3 /   ----------- + -----------  + ----------------------------------|                      /                2*|3 /   ----------- + -----------  + ----------------------------------|          /                    -1 + |3 /   ----------- + -----------  + ----------------------------------|                      /                2*|3 /   ----------- + -----------  + ----------------------------------|          /                    -1 + |3 /   ----------- + -----------  + ----------------------------------|      
           |\/         12           108               ___________________________|                     /                   |\/         12           108               ___________________________|         /                          |\/         12           108               ___________________________|                     /                   |\/         12           108               ___________________________|         /                          |\/         12           108               ___________________________|      
           |                                         /   ___ 4 ___    3/4   ____ |                    /                    |                                         /   ___ 4 ___    3/4   ____ |        /                           |                                         /   ___ 4 ___    3/4   ____ |                    /                    |                                         /   ___ 4 ___    3/4   ____ |        /                           |                                         /   ___ 4 ___    3/4   ____ |      
           |                                        /  \/ 2 *\/ 3    3   *\/ 38  |                   /                     |                                        /  \/ 2 *\/ 3    3   *\/ 38  |       /                            |                                        /  \/ 2 *\/ 3    3   *\/ 38  |                   /                     |                                        /  \/ 2 *\/ 3    3   *\/ 38  |       /                            |                                        /  \/ 2 *\/ 3    3   *\/ 38  |      
           |                                   9*3 /   ----------- + ----------- |                  /                      |                                   9*3 /   ----------- + ----------- |      /                             |                                   9*3 /   ----------- + ----------- |                  /                      |                                   9*3 /   ----------- + ----------- |    4 /                             |                                   9*3 /   ----------- + ----------- |      
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- -- + -----------------------------------------------------------------------------              /             - -- + -----------------------------------------------------------------------------                                                                                                                         /             - -- + -----------------------------------------------------------------------------                                                                                                               
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            |    /   ___ 4 ___    3/4   ____                    ___               |            /                            |    /   ___ 4 ___    3/4   ____                    ___               |                                                                                                                       /                            |    /   ___ 4 ___    3/4   ____                    ___               |                                                                                                                
            |   /  \/ 2 *\/ 3    3   *\/ 38                   \/ 3                |           /                             |   /  \/ 2 *\/ 3    3   *\/ 38                   \/ 3                |                                                                                                                      /                             |   /  \/ 2 *\/ 3    3   *\/ 38                   \/ 3                |                                                                                                                
       -1 + |3 /   ----------- + -----------  + ----------------------------------|          /                         -1 + |3 /   ----------- + -----------  + ----------------------------------|                                                                                                                     /                         -1 + |3 /   ----------- + -----------  + ----------------------------------|                                                                                                                
            |\/         12           108               ___________________________|         /                               |\/         12           108               ___________________________|                                                                                                                    /                               |\/         12           108               ___________________________|                                                                                                                
            |                                         /   ___ 4 ___    3/4   ____ |        /                                |                                         /   ___ 4 ___    3/4   ____ |                                                                                                                   /                                |                                         /   ___ 4 ___    3/4   ____ |                                                                                                                
            |                                        /  \/ 2 *\/ 3    3   *\/ 38  |       /                                 |                                        /  \/ 2 *\/ 3    3   *\/ 38  |                                                                                                                  /                                 |                                        /  \/ 2 *\/ 3    3   *\/ 38  |                                                                                                                
            |                                   9*3 /   ----------- + ----------- |      /                                  |                                   9*3 /   ----------- + ----------- |                                                                                                               4 /                                  |                                   9*3 /   ----------- + ----------- |                                                                                                                
            \                                     \/         12           108     /    \/                                   \                                     \/         12           108     /                                                                                                               \/                                   \                                     \/         12           108     /                                                                                                                

significa que una de las soluciones de nuestra ecuación será con:
$$x < \frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}$$
 _____           _____          
      \         /
-------ο-------ο-------
       x2      x1

Recibiremos otras soluciones de la desigualdad pasando al polo siguiente etc.
etc.
Respuesta:
$$x < \frac{2 \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}{-1 + \left(\frac{\sqrt{3}}{9 \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}} + \sqrt[3]{\frac{2^{\frac{3}{4}} \cdot 3 \sqrt{38} \sqrt[4]{54}}{648} + \frac{\sqrt{2} \sqrt[4]{3}}{12}}\right)^{4}}$$
$$x > 0$$
Solución de la desigualdad en el gráfico