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|x+3|=a la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
|x + 3| = a
$$\left|{x + 3}\right| = a$$
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.
$$x + 3 \geq 0$$
o
$$-3 \leq x \wedge x < \infty$$
obtenemos la ecuación
$$- a + \left(x + 3\right) = 0$$
simplificamos, obtenemos
$$- a + x + 3 = 0$$
la resolución en este intervalo:
$$x_{1} = a - 3$$

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


Entonces la respuesta definitiva es:
$$x_{1} = a - 3$$
$$x_{2} = - a - 3$$
Gráfica
Suma y producto de raíces [src]
suma
    //-3 - a  for a > 0\     //-3 - a  for a > 0\       //-3 + a  for a >= 0\     //-3 + a  for a >= 0\
I*im|<                 | + re|<                 | + I*im|<                  | + re|<                  |
    \\ nan    otherwise/     \\ nan    otherwise/       \\ nan    otherwise /     \\ nan    otherwise /
$$\left(\operatorname{re}{\left(\begin{cases} - a - 3 & \text{for}\: a > 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} - a - 3 & \text{for}\: a > 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}\right) + \left(\operatorname{re}{\left(\begin{cases} a - 3 & \text{for}\: a \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} a - 3 & \text{for}\: a \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}\right)$$
=
    //-3 + a  for a >= 0\       //-3 - a  for a > 0\     //-3 + a  for a >= 0\     //-3 - a  for a > 0\
I*im|<                  | + I*im|<                 | + re|<                  | + re|<                 |
    \\ nan    otherwise /       \\ nan    otherwise/     \\ nan    otherwise /     \\ nan    otherwise/
$$\operatorname{re}{\left(\begin{cases} - a - 3 & \text{for}\: a > 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + \operatorname{re}{\left(\begin{cases} a - 3 & \text{for}\: a \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} - a - 3 & \text{for}\: a > 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} a - 3 & \text{for}\: a \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}$$
producto
/    //-3 - a  for a > 0\     //-3 - a  for a > 0\\ /    //-3 + a  for a >= 0\     //-3 + a  for a >= 0\\
|I*im|<                 | + re|<                 ||*|I*im|<                  | + re|<                  ||
\    \\ nan    otherwise/     \\ nan    otherwise// \    \\ nan    otherwise /     \\ nan    otherwise //
$$\left(\operatorname{re}{\left(\begin{cases} - a - 3 & \text{for}\: a > 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} - a - 3 & \text{for}\: a > 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}\right) \left(\operatorname{re}{\left(\begin{cases} a - 3 & \text{for}\: a \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} a - 3 & \text{for}\: a \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}\right)$$
=
/-(-3 + I*im(a) + re(a))*(3 + I*im(a) + re(a))  for a > 0
<                                                        
\                     nan                       otherwise
$$\begin{cases} - \left(\operatorname{re}{\left(a\right)} + i \operatorname{im}{\left(a\right)} - 3\right) \left(\operatorname{re}{\left(a\right)} + i \operatorname{im}{\left(a\right)} + 3\right) & \text{for}\: a > 0 \\\text{NaN} & \text{otherwise} \end{cases}$$
Piecewise((-(-3 + i*im(a) + re(a))*(3 + i*im(a) + re(a)), a > 0), (nan, True))
Respuesta rápida [src]
         //-3 - a  for a > 0\     //-3 - a  for a > 0\
x1 = I*im|<                 | + re|<                 |
         \\ nan    otherwise/     \\ nan    otherwise/
$$x_{1} = \operatorname{re}{\left(\begin{cases} - a - 3 & \text{for}\: a > 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} - a - 3 & \text{for}\: a > 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}$$
         //-3 + a  for a >= 0\     //-3 + a  for a >= 0\
x2 = I*im|<                  | + re|<                  |
         \\ nan    otherwise /     \\ nan    otherwise /
$$x_{2} = \operatorname{re}{\left(\begin{cases} a - 3 & \text{for}\: a \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)} + i \operatorname{im}{\left(\begin{cases} a - 3 & \text{for}\: a \geq 0 \\\text{NaN} & \text{otherwise} \end{cases}\right)}$$
Eq(x2, re(Piecewise((a - 3, a >= 0), (nan, True))) + i*im(Piecewise((a - 3, a >= 0), (nan, True))))