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sqrt(x^3*(x-12)+54*x*(x-2)+81)-sqrt(-x*(|x|))=0 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
   _________________________________                 
  /  3                                   ________    
\/  x *(x - 12) + 54*x*(x - 2) + 81  - \/ -x*|x|  = 0
$$- \sqrt{- x \left|{x}\right|} + \sqrt{\left(x^{3} \left(x - 12\right) + 54 x \left(x - 2\right)\right) + 81} = 0$$
Gráfica
Respuesta rápida [src]
         //           ________________                  ________________     \     //           ________________                  ________________     \
         ||          /              2                  /              2      |     ||          /              2                  /              2      |
         ||    I   \/  -36 + (6 - I)             I   \/  -36 + (6 - I)       |     ||    I   \/  -36 + (6 - I)             I   \/  -36 + (6 - I)       |
x1 = I*im|<3 - - - -------------------  for -3 + - + ------------------- <= 0| + re|<3 - - - -------------------  for -3 + - + ------------------- <= 0|
         ||    2            2                    2            2              |     ||    2            2                    2            2              |
         ||                                                                  |     ||                                                                  |
         \\            nan                            otherwise              /     \\            nan                            otherwise              /
$$x_{1} = \operatorname{re}{\left(\begin{cases} 3 - \frac{i}{2} - \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} & \text{for}\: -3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} + \frac{i}{2} \leq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 - \frac{i}{2} - \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} & \text{for}\: -3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} + \frac{i}{2} \leq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}$$
         //          ___________                ___________     \     //          ___________                ___________     \
         ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |     ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |
         ||3 + - + -------------  for 3 + - + ------------- >= 0|     ||3 + - + -------------  for 3 + - + ------------- >= 0|
x2 = I*im|<    2         2                2         2           | + re|<    2         2                2         2           |
         ||                                                     |     ||                                                     |
         ||         nan                     otherwise           |     ||         nan                     otherwise           |
         \\                                                     /     \\                                                     /
$$x_{2} = \operatorname{re}{\left(\begin{cases} 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} & \text{for}\: 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} & \text{for}\: 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}$$
         //       ________________                 ________________         \     //       ________________                 ________________         \
         ||      /              2                 /              2          |     ||      /              2                 /              2          |
         ||    \/  -36 + (6 - I)     I          \/  -36 + (6 - I)     I     |     ||    \/  -36 + (6 - I)     I          \/  -36 + (6 - I)     I     |
x3 = I*im|<3 + ------------------- - -  for 3 + ------------------- - - >= 0| + re|<3 + ------------------- - -  for 3 + ------------------- - - >= 0|
         ||             2            2                   2            2     |     ||             2            2                   2            2     |
         ||                                                                 |     ||                                                                 |
         \\            nan                           otherwise              /     \\            nan                           otherwise              /
$$x_{3} = \operatorname{re}{\left(\begin{cases} 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} & \text{for}\: 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} & \text{for}\: 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}$$
         //          ___________                ___________     \     //          ___________                ___________     \
         ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |     ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |
         ||3 + - - -------------  for 3 + - - ------------- >= 0|     ||3 + - - -------------  for 3 + - - ------------- >= 0|
x4 = I*im|<    2         2                2         2           | + re|<    2         2                2         2           |
         ||                                                     |     ||                                                     |
         ||         nan                     otherwise           |     ||         nan                     otherwise           |
         \\                                                     /     \\                                                     /
$$x_{4} = \operatorname{re}{\left(\begin{cases} 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} & \text{for}\: 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} & \text{for}\: 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}$$
x4 = re(Piecewise((3 - sqrt(-1 + 12*i/2 + i/2, 3 - sqrt(-1 + 12*i)/2 + i/2 >= 0), (nan, True))) + i*im(Piecewise((3 - sqrt(-1 + 12*i)/2 + i/2, 3 - sqrt(-1 + 12*i)/2 + i/2 >= 0), (nan, True))))
Suma y producto de raíces [src]
suma
    //           ________________                  ________________     \     //           ________________                  ________________     \       //          ___________                ___________     \     //          ___________                ___________     \       //       ________________                 ________________         \     //       ________________                 ________________         \       //          ___________                ___________     \     //          ___________                ___________     \
    ||          /              2                  /              2      |     ||          /              2                  /              2      |       ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |     ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |       ||      /              2                 /              2          |     ||      /              2                 /              2          |       ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |     ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |
    ||    I   \/  -36 + (6 - I)             I   \/  -36 + (6 - I)       |     ||    I   \/  -36 + (6 - I)             I   \/  -36 + (6 - I)       |       ||3 + - + -------------  for 3 + - + ------------- >= 0|     ||3 + - + -------------  for 3 + - + ------------- >= 0|       ||    \/  -36 + (6 - I)     I          \/  -36 + (6 - I)     I     |     ||    \/  -36 + (6 - I)     I          \/  -36 + (6 - I)     I     |       ||3 + - - -------------  for 3 + - - ------------- >= 0|     ||3 + - - -------------  for 3 + - - ------------- >= 0|
I*im|<3 - - - -------------------  for -3 + - + ------------------- <= 0| + re|<3 - - - -------------------  for -3 + - + ------------------- <= 0| + I*im|<    2         2                2         2           | + re|<    2         2                2         2           | + I*im|<3 + ------------------- - -  for 3 + ------------------- - - >= 0| + re|<3 + ------------------- - -  for 3 + ------------------- - - >= 0| + I*im|<    2         2                2         2           | + re|<    2         2                2         2           |
    ||    2            2                    2            2              |     ||    2            2                    2            2              |       ||                                                     |     ||                                                     |       ||             2            2                   2            2     |     ||             2            2                   2            2     |       ||                                                     |     ||                                                     |
    ||                                                                  |     ||                                                                  |       ||         nan                     otherwise           |     ||         nan                     otherwise           |       ||                                                                 |     ||                                                                 |       ||         nan                     otherwise           |     ||         nan                     otherwise           |
    \\            nan                            otherwise              /     \\            nan                            otherwise              /       \\                                                     /     \\                                                     /       \\            nan                           otherwise              /     \\            nan                           otherwise              /       \\                                                     /     \\                                                     /
$$\left(\left(\left(\operatorname{re}{\left(\begin{cases} 3 - \frac{i}{2} - \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} & \text{for}\: -3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} + \frac{i}{2} \leq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 - \frac{i}{2} - \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} & \text{for}\: -3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} + \frac{i}{2} \leq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}\right) + \left(\operatorname{re}{\left(\begin{cases} 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} & \text{for}\: 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} & \text{for}\: 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}\right)\right) + \left(\operatorname{re}{\left(\begin{cases} 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} & \text{for}\: 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} & \text{for}\: 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}\right)\right) + \left(\operatorname{re}{\left(\begin{cases} 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} & \text{for}\: 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} & \text{for}\: 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}\right)$$
=
    //          ___________                ___________     \       //          ___________                ___________     \       //       ________________                 ________________         \       //           ________________                  ________________     \     //          ___________                ___________     \     //          ___________                ___________     \     //       ________________                 ________________         \     //           ________________                  ________________     \
    ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |       ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |       ||      /              2                 /              2          |       ||          /              2                  /              2      |     ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |     ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |     ||      /              2                 /              2          |     ||          /              2                  /              2      |
    ||3 + - + -------------  for 3 + - + ------------- >= 0|       ||3 + - - -------------  for 3 + - - ------------- >= 0|       ||    \/  -36 + (6 - I)     I          \/  -36 + (6 - I)     I     |       ||    I   \/  -36 + (6 - I)             I   \/  -36 + (6 - I)       |     ||3 + - + -------------  for 3 + - + ------------- >= 0|     ||3 + - - -------------  for 3 + - - ------------- >= 0|     ||    \/  -36 + (6 - I)     I          \/  -36 + (6 - I)     I     |     ||    I   \/  -36 + (6 - I)             I   \/  -36 + (6 - I)       |
I*im|<    2         2                2         2           | + I*im|<    2         2                2         2           | + I*im|<3 + ------------------- - -  for 3 + ------------------- - - >= 0| + I*im|<3 - - - -------------------  for -3 + - + ------------------- <= 0| + re|<    2         2                2         2           | + re|<    2         2                2         2           | + re|<3 + ------------------- - -  for 3 + ------------------- - - >= 0| + re|<3 - - - -------------------  for -3 + - + ------------------- <= 0|
    ||                                                     |       ||                                                     |       ||             2            2                   2            2     |       ||    2            2                    2            2              |     ||                                                     |     ||                                                     |     ||             2            2                   2            2     |     ||    2            2                    2            2              |
    ||         nan                     otherwise           |       ||         nan                     otherwise           |       ||                                                                 |       ||                                                                  |     ||         nan                     otherwise           |     ||         nan                     otherwise           |     ||                                                                 |     ||                                                                  |
    \\                                                     /       \\                                                     /       \\            nan                           otherwise              /       \\            nan                            otherwise              /     \\                                                     /     \\                                                     /     \\            nan                           otherwise              /     \\            nan                            otherwise              /
$$\operatorname{re}{\left(\begin{cases} 3 - \frac{i}{2} - \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} & \text{for}\: -3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} + \frac{i}{2} \leq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + \operatorname{re}{\left(\begin{cases} 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} & \text{for}\: 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + \operatorname{re}{\left(\begin{cases} 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} & \text{for}\: 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + \operatorname{re}{\left(\begin{cases} 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} & \text{for}\: 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 - \frac{i}{2} - \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} & \text{for}\: -3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} + \frac{i}{2} \leq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} & \text{for}\: 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} & \text{for}\: 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} & \text{for}\: 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}$$
producto
/    //           ________________                  ________________     \     //           ________________                  ________________     \\ /    //          ___________                ___________     \     //          ___________                ___________     \\ /    //       ________________                 ________________         \     //       ________________                 ________________         \\ /    //          ___________                ___________     \     //          ___________                ___________     \\
|    ||          /              2                  /              2      |     ||          /              2                  /              2      || |    ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |     ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      || |    ||      /              2                 /              2          |     ||      /              2                 /              2          || |    ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      |     ||    I   \/ -1 + 12*I           I   \/ -1 + 12*I      ||
|    ||    I   \/  -36 + (6 - I)             I   \/  -36 + (6 - I)       |     ||    I   \/  -36 + (6 - I)             I   \/  -36 + (6 - I)       || |    ||3 + - + -------------  for 3 + - + ------------- >= 0|     ||3 + - + -------------  for 3 + - + ------------- >= 0|| |    ||    \/  -36 + (6 - I)     I          \/  -36 + (6 - I)     I     |     ||    \/  -36 + (6 - I)     I          \/  -36 + (6 - I)     I     || |    ||3 + - - -------------  for 3 + - - ------------- >= 0|     ||3 + - - -------------  for 3 + - - ------------- >= 0||
|I*im|<3 - - - -------------------  for -3 + - + ------------------- <= 0| + re|<3 - - - -------------------  for -3 + - + ------------------- <= 0||*|I*im|<    2         2                2         2           | + re|<    2         2                2         2           ||*|I*im|<3 + ------------------- - -  for 3 + ------------------- - - >= 0| + re|<3 + ------------------- - -  for 3 + ------------------- - - >= 0||*|I*im|<    2         2                2         2           | + re|<    2         2                2         2           ||
|    ||    2            2                    2            2              |     ||    2            2                    2            2              || |    ||                                                     |     ||                                                     || |    ||             2            2                   2            2     |     ||             2            2                   2            2     || |    ||                                                     |     ||                                                     ||
|    ||                                                                  |     ||                                                                  || |    ||         nan                     otherwise           |     ||         nan                     otherwise           || |    ||                                                                 |     ||                                                                 || |    ||         nan                     otherwise           |     ||         nan                     otherwise           ||
\    \\            nan                            otherwise              /     \\            nan                            otherwise              // \    \\                                                     /     \\                                                     // \    \\            nan                           otherwise              /     \\            nan                           otherwise              // \    \\                                                     /     \\                                                     //
$$\left(\operatorname{re}{\left(\begin{cases} 3 - \frac{i}{2} - \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} & \text{for}\: -3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} + \frac{i}{2} \leq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 - \frac{i}{2} - \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} & \text{for}\: -3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} + \frac{i}{2} \leq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}\right) \left(\operatorname{re}{\left(\begin{cases} 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} & \text{for}\: 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} & \text{for}\: 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}\right) \left(\operatorname{re}{\left(\begin{cases} 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} & \text{for}\: 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} & \text{for}\: 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}\right) \left(\operatorname{re}{\left(\begin{cases} 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} & \text{for}\: 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} & \text{for}\: 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}\right)$$
=
/            /                                   ________________                                                   ________________     \
|            |          ___________             /              2                      ___________                  /              2      |
|            |    I   \/ -1 + 12*I            \/  -36 + (6 - I)     I           I   \/ -1 + 12*I             I   \/  -36 + (6 - I)       |
<81   for And|3 + - + ------------- >= 0, 3 + ------------------- - - >= 0, 3 + - - ------------- >= 0, -3 + - + ------------------- <= 0|
|            \    2         2                          2            2           2         2                  2            2              /
|                                                                                                                                         
\nan                                                               otherwise                                                              
$$\begin{cases} 81 & \text{for}\: 3 + \frac{i}{2} + \frac{\sqrt{-1 + 12 i}}{2} \geq 0 \wedge 3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} - \frac{i}{2} \geq 0 \wedge 3 - \frac{\sqrt{-1 + 12 i}}{2} + \frac{i}{2} \geq 0 \wedge -3 + \frac{\sqrt{-36 + \left(6 - i\right)^{2}}}{2} + \frac{i}{2} \leq 0 \\\text{NaN} & \text{otherwise} \end{cases}$$
Piecewise((81, (3 + i/2 + sqrt(-1 + 12*i)/2 >= 0)∧(3 + i/2 - sqrt(-1 + 12*i)/2 >= 0)∧(3 + sqrt(-36 + (6 - i)^2)/2 - i/2 >= 0)∧(-3 + i/2 + sqrt(-36 + (6 - i)^2)/2 <= 0)), (nan, True))
Respuesta numérica [src]
x1 = 4.38669370582532 + 1.6639586236823*i
x2 = 1.87329098020607 - 0.899121596812672*i
x3 = 1.87329098020607 + 0.899121596812672*i
x3 = 1.87329098020607 + 0.899121596812672*i