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sqrt(1-2x)=a-7absolutex la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
  _________            
\/ 1 - 2*x  = a - 7*|x|
$$\sqrt{1 - 2 x} = a - 7 \left|{x}\right|$$
Solución detallada
Para cada expresión dentro del módulo en la ecuación
admitimos los casos cuando la expresión correspondiente es ">= 0" o "< 0",
resolvemos las ecuaciones obtenidas.

1.
$$x \geq 0$$
o
$$0 \leq x \wedge x < \infty$$
obtenemos la ecuación
$$- a + 7 x + \sqrt{1 - 2 x} = 0$$
simplificamos, obtenemos
$$- a + 7 x + \sqrt{1 - 2 x} = 0$$
la resolución en este intervalo:
$$x_{1} = \frac{a}{7} - \frac{\sqrt{50 - 14 a}}{49} - \frac{1}{49}$$
$$x_{2} = \frac{a}{7} + \frac{\sqrt{50 - 14 a}}{49} - \frac{1}{49}$$

2.
$$x < 0$$
o
$$-\infty < x \wedge x < 0$$
obtenemos la ecuación
$$- a + 7 \left(- x\right) + \sqrt{1 - 2 x} = 0$$
simplificamos, obtenemos
$$- a - 7 x + \sqrt{1 - 2 x} = 0$$
la resolución en este intervalo:
$$x_{3} = - \frac{a}{7} - \frac{\sqrt{14 a + 50}}{49} - \frac{1}{49}$$
$$x_{4} = - \frac{a}{7} + \frac{\sqrt{14 a + 50}}{49} - \frac{1}{49}$$


Entonces la respuesta definitiva es:
$$x_{1} = \frac{a}{7} - \frac{\sqrt{50 - 14 a}}{49} - \frac{1}{49}$$
$$x_{2} = \frac{a}{7} + \frac{\sqrt{50 - 14 a}}{49} - \frac{1}{49}$$
$$x_{3} = - \frac{a}{7} - \frac{\sqrt{14 a + 50}}{49} - \frac{1}{49}$$
$$x_{4} = - \frac{a}{7} + \frac{\sqrt{14 a + 50}}{49} - \frac{1}{49}$$
Gráfica
Respuesta rápida [src]
         //             ___________                 ___   __________    \     //             ___________                 ___   __________    \
         ||  1    a   \/ 50 + 14*a       1    a   \/ 2 *\/ 25 + 7*a     |     ||  1    a   \/ 50 + 14*a       1    a   \/ 2 *\/ 25 + 7*a     |
         ||- -- - - - -------------  for -- + - + ------------------ > 0|     ||- -- - - - -------------  for -- + - + ------------------ > 0|
x1 = I*im|<  49   7         49           49   7           49            | + re|<  49   7         49           49   7           49            |
         ||                                                             |     ||                                                             |
         ||          nan                          otherwise             |     ||          nan                          otherwise             |
         \\                                                             /     \\                                                             /
$$x_{1} = \operatorname{re}{\left(\begin{cases} - \frac{a}{7} - \frac{\sqrt{14 a + 50}}{49} - \frac{1}{49} & \text{for}\: \frac{a}{7} + \frac{\sqrt{2} \sqrt{7 a + 25}}{49} + \frac{1}{49} > 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} - \frac{a}{7} - \frac{\sqrt{14 a + 50}}{49} - \frac{1}{49} & \text{for}\: \frac{a}{7} + \frac{\sqrt{2} \sqrt{7 a + 25}}{49} + \frac{1}{49} > 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}$$
         //             ___________                 ___   __________    \     //             ___________                 ___   __________    \
         ||  1    a   \/ 50 + 14*a       1    a   \/ 2 *\/ 25 + 7*a     |     ||  1    a   \/ 50 + 14*a       1    a   \/ 2 *\/ 25 + 7*a     |
         ||- -- - - + -------------  for -- + - - ------------------ > 0|     ||- -- - - + -------------  for -- + - - ------------------ > 0|
x2 = I*im|<  49   7         49           49   7           49            | + re|<  49   7         49           49   7           49            |
         ||                                                             |     ||                                                             |
         ||          nan                          otherwise             |     ||          nan                          otherwise             |
         \\                                                             /     \\                                                             /
$$x_{2} = \operatorname{re}{\left(\begin{cases} - \frac{a}{7} + \frac{\sqrt{14 a + 50}}{49} - \frac{1}{49} & \text{for}\: \frac{a}{7} - \frac{\sqrt{2} \sqrt{7 a + 25}}{49} + \frac{1}{49} > 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} - \frac{a}{7} + \frac{\sqrt{14 a + 50}}{49} - \frac{1}{49} & \text{for}\: \frac{a}{7} - \frac{\sqrt{2} \sqrt{7 a + 25}}{49} + \frac{1}{49} > 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}$$
         //         ___________                     ___   __________     \     //         ___________                     ___   __________     \
         ||  1    \/ 50 - 14*a    a      1    a   \/ 2 *\/ 25 - 7*a      |     ||  1    \/ 50 - 14*a    a      1    a   \/ 2 *\/ 25 - 7*a      |
         ||- -- - ------------- + -  for -- - - + ------------------ <= 0|     ||- -- - ------------- + -  for -- - - + ------------------ <= 0|
x3 = I*im|<  49         49        7      49   7           49             | + re|<  49         49        7      49   7           49             |
         ||                                                              |     ||                                                              |
         ||          nan                          otherwise              |     ||          nan                          otherwise              |
         \\                                                              /     \\                                                              /
$$x_{3} = \operatorname{re}{\left(\begin{cases} \frac{a}{7} - \frac{\sqrt{50 - 14 a}}{49} - \frac{1}{49} & \text{for}\: - \frac{a}{7} + \frac{\sqrt{2} \sqrt{25 - 7 a}}{49} + \frac{1}{49} \leq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} \frac{a}{7} - \frac{\sqrt{50 - 14 a}}{49} - \frac{1}{49} & \text{for}\: - \frac{a}{7} + \frac{\sqrt{2} \sqrt{25 - 7 a}}{49} + \frac{1}{49} \leq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}$$
         //             ___________                   ___   __________     \     //             ___________                   ___   __________     \
         ||  1    a   \/ 50 - 14*a         1    a   \/ 2 *\/ 25 - 7*a      |     ||  1    a   \/ 50 - 14*a         1    a   \/ 2 *\/ 25 - 7*a      |
         ||- -- + - + -------------  for - -- + - + ------------------ >= 0|     ||- -- + - + -------------  for - -- + - + ------------------ >= 0|
x4 = I*im|<  49   7         49             49   7           49             | + re|<  49   7         49             49   7           49             |
         ||                                                                |     ||                                                                |
         ||          nan                           otherwise               |     ||          nan                           otherwise               |
         \\                                                                /     \\                                                                /
$$x_{4} = \operatorname{re}{\left(\begin{cases} \frac{a}{7} + \frac{\sqrt{50 - 14 a}}{49} - \frac{1}{49} & \text{for}\: \frac{a}{7} + \frac{\sqrt{2} \sqrt{25 - 7 a}}{49} - \frac{1}{49} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} \frac{a}{7} + \frac{\sqrt{50 - 14 a}}{49} - \frac{1}{49} & \text{for}\: \frac{a}{7} + \frac{\sqrt{2} \sqrt{25 - 7 a}}{49} - \frac{1}{49} \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}$$
x4 = re(Piecewise((a/7 + sqrt(50 - 14*a/49 - 1/49, a/7 + sqrt(2)*sqrt(25 - 7*a)/49 - 1/49 >= 0), (nan, True))) + i*im(Piecewise((a/7 + sqrt(50 - 14*a)/49 - 1/49, a/7 + sqrt(2)*sqrt(25 - 7*a)/49 - 1/49 >= 0), (nan, True))))