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(12y+18)(1,6-0,2y)=o la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
            /8   y\    
(12*y + 18)*|- - -| = o
            \5   5/    
$$\left(\frac{8}{5} - \frac{y}{5}\right) \left(12 y + 18\right) = o$$
Solución detallada
Transportemos el miembro derecho de la ecuación al
miembro izquierdo de la ecuación con el signo negativo.

La ecuación se convierte de
$$\left(\frac{8}{5} - \frac{y}{5}\right) \left(12 y + 18\right) = o$$
en
$$- o + \left(\frac{8}{5} - \frac{y}{5}\right) \left(12 y + 18\right) = 0$$
Abramos la expresión en la ecuación
$$- o + \left(\frac{8}{5} - \frac{y}{5}\right) \left(12 y + 18\right) = 0$$
Obtenemos la ecuación cuadrática
$$- o - \frac{12 y^{2}}{5} + \frac{78 y}{5} + \frac{144}{5} = 0$$
Es la ecuación de la forma
a*y^2 + b*y + c = 0

La ecuación cuadrática puede ser resuelta
con la ayuda del discriminante.
Las raíces de la ecuación cuadrática:
$$y_{1} = \frac{\sqrt{D} - b}{2 a}$$
$$y_{2} = \frac{- \sqrt{D} - b}{2 a}$$
donde D = b^2 - 4*a*c es el discriminante.
Como
$$a = - \frac{12}{5}$$
$$b = \frac{78}{5}$$
$$c = \frac{144}{5} - o$$
, entonces
D = b^2 - 4 * a * c = 

(78/5)^2 - 4 * (-12/5) * (144/5 - o) = 12996/25 - 48*o/5

La ecuación tiene dos raíces.
y1 = (-b + sqrt(D)) / (2*a)

y2 = (-b - sqrt(D)) / (2*a)

o
$$y_{1} = \frac{13}{4} - \frac{5 \sqrt{\frac{12996}{25} - \frac{48 o}{5}}}{24}$$
$$y_{2} = \frac{5 \sqrt{\frac{12996}{25} - \frac{48 o}{5}}}{24} + \frac{13}{4}$$
Gráfica
Respuesta rápida [src]
             __________________________________                                               __________________________________                                       
          4 /                  2          2        /atan2(-60*im(o), 3249 - 60*re(o))\     4 /                  2          2        /atan2(-60*im(o), 3249 - 60*re(o))\
          \/  (3249 - 60*re(o))  + 3600*im (o) *cos|---------------------------------|   I*\/  (3249 - 60*re(o))  + 3600*im (o) *sin|---------------------------------|
     13                                            \                2                /                                              \                2                /
y1 = -- - ---------------------------------------------------------------------------- - ------------------------------------------------------------------------------
     4                                         12                                                                              12                                      
$$y_{1} = - \frac{i \sqrt[4]{\left(3249 - 60 \operatorname{re}{\left(o\right)}\right)^{2} + 3600 \left(\operatorname{im}{\left(o\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- 60 \operatorname{im}{\left(o\right)},3249 - 60 \operatorname{re}{\left(o\right)} \right)}}{2} \right)}}{12} - \frac{\sqrt[4]{\left(3249 - 60 \operatorname{re}{\left(o\right)}\right)^{2} + 3600 \left(\operatorname{im}{\left(o\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- 60 \operatorname{im}{\left(o\right)},3249 - 60 \operatorname{re}{\left(o\right)} \right)}}{2} \right)}}{12} + \frac{13}{4}$$
             __________________________________                                               __________________________________                                       
          4 /                  2          2        /atan2(-60*im(o), 3249 - 60*re(o))\     4 /                  2          2        /atan2(-60*im(o), 3249 - 60*re(o))\
          \/  (3249 - 60*re(o))  + 3600*im (o) *cos|---------------------------------|   I*\/  (3249 - 60*re(o))  + 3600*im (o) *sin|---------------------------------|
     13                                            \                2                /                                              \                2                /
y2 = -- + ---------------------------------------------------------------------------- + ------------------------------------------------------------------------------
     4                                         12                                                                              12                                      
$$y_{2} = \frac{i \sqrt[4]{\left(3249 - 60 \operatorname{re}{\left(o\right)}\right)^{2} + 3600 \left(\operatorname{im}{\left(o\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- 60 \operatorname{im}{\left(o\right)},3249 - 60 \operatorname{re}{\left(o\right)} \right)}}{2} \right)}}{12} + \frac{\sqrt[4]{\left(3249 - 60 \operatorname{re}{\left(o\right)}\right)^{2} + 3600 \left(\operatorname{im}{\left(o\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- 60 \operatorname{im}{\left(o\right)},3249 - 60 \operatorname{re}{\left(o\right)} \right)}}{2} \right)}}{12} + \frac{13}{4}$$
y2 = i*((3249 - 60*re(o))^2 + 3600*im(o)^2)^(1/4)*sin(atan2(-60*im(o, 3249 - 60*re(o))/2)/12 + ((3249 - 60*re(o))^2 + 3600*im(o)^2)^(1/4)*cos(atan2(-60*im(o), 3249 - 60*re(o))/2)/12 + 13/4)
Suma y producto de raíces [src]
suma
        __________________________________                                               __________________________________                                                  __________________________________                                               __________________________________                                       
     4 /                  2          2        /atan2(-60*im(o), 3249 - 60*re(o))\     4 /                  2          2        /atan2(-60*im(o), 3249 - 60*re(o))\        4 /                  2          2        /atan2(-60*im(o), 3249 - 60*re(o))\     4 /                  2          2        /atan2(-60*im(o), 3249 - 60*re(o))\
     \/  (3249 - 60*re(o))  + 3600*im (o) *cos|---------------------------------|   I*\/  (3249 - 60*re(o))  + 3600*im (o) *sin|---------------------------------|        \/  (3249 - 60*re(o))  + 3600*im (o) *cos|---------------------------------|   I*\/  (3249 - 60*re(o))  + 3600*im (o) *sin|---------------------------------|
13                                            \                2                /                                              \                2                /   13                                            \                2                /                                              \                2                /
-- - ---------------------------------------------------------------------------- - ------------------------------------------------------------------------------ + -- + ---------------------------------------------------------------------------- + ------------------------------------------------------------------------------
4                                         12                                                                              12                                         4                                         12                                                                              12                                      
$$\left(- \frac{i \sqrt[4]{\left(3249 - 60 \operatorname{re}{\left(o\right)}\right)^{2} + 3600 \left(\operatorname{im}{\left(o\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- 60 \operatorname{im}{\left(o\right)},3249 - 60 \operatorname{re}{\left(o\right)} \right)}}{2} \right)}}{12} - \frac{\sqrt[4]{\left(3249 - 60 \operatorname{re}{\left(o\right)}\right)^{2} + 3600 \left(\operatorname{im}{\left(o\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- 60 \operatorname{im}{\left(o\right)},3249 - 60 \operatorname{re}{\left(o\right)} \right)}}{2} \right)}}{12} + \frac{13}{4}\right) + \left(\frac{i \sqrt[4]{\left(3249 - 60 \operatorname{re}{\left(o\right)}\right)^{2} + 3600 \left(\operatorname{im}{\left(o\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- 60 \operatorname{im}{\left(o\right)},3249 - 60 \operatorname{re}{\left(o\right)} \right)}}{2} \right)}}{12} + \frac{\sqrt[4]{\left(3249 - 60 \operatorname{re}{\left(o\right)}\right)^{2} + 3600 \left(\operatorname{im}{\left(o\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- 60 \operatorname{im}{\left(o\right)},3249 - 60 \operatorname{re}{\left(o\right)} \right)}}{2} \right)}}{12} + \frac{13}{4}\right)$$
=
13/2
$$\frac{13}{2}$$
producto
/        __________________________________                                               __________________________________                                       \ /        __________________________________                                               __________________________________                                       \
|     4 /                  2          2        /atan2(-60*im(o), 3249 - 60*re(o))\     4 /                  2          2        /atan2(-60*im(o), 3249 - 60*re(o))\| |     4 /                  2          2        /atan2(-60*im(o), 3249 - 60*re(o))\     4 /                  2          2        /atan2(-60*im(o), 3249 - 60*re(o))\|
|     \/  (3249 - 60*re(o))  + 3600*im (o) *cos|---------------------------------|   I*\/  (3249 - 60*re(o))  + 3600*im (o) *sin|---------------------------------|| |     \/  (3249 - 60*re(o))  + 3600*im (o) *cos|---------------------------------|   I*\/  (3249 - 60*re(o))  + 3600*im (o) *sin|---------------------------------||
|13                                            \                2                /                                              \                2                /| |13                                            \                2                /                                              \                2                /|
|-- - ---------------------------------------------------------------------------- - ------------------------------------------------------------------------------|*|-- + ---------------------------------------------------------------------------- + ------------------------------------------------------------------------------|
\4                                         12                                                                              12                                      / \4                                         12                                                                              12                                      /
$$\left(- \frac{i \sqrt[4]{\left(3249 - 60 \operatorname{re}{\left(o\right)}\right)^{2} + 3600 \left(\operatorname{im}{\left(o\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- 60 \operatorname{im}{\left(o\right)},3249 - 60 \operatorname{re}{\left(o\right)} \right)}}{2} \right)}}{12} - \frac{\sqrt[4]{\left(3249 - 60 \operatorname{re}{\left(o\right)}\right)^{2} + 3600 \left(\operatorname{im}{\left(o\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- 60 \operatorname{im}{\left(o\right)},3249 - 60 \operatorname{re}{\left(o\right)} \right)}}{2} \right)}}{12} + \frac{13}{4}\right) \left(\frac{i \sqrt[4]{\left(3249 - 60 \operatorname{re}{\left(o\right)}\right)^{2} + 3600 \left(\operatorname{im}{\left(o\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- 60 \operatorname{im}{\left(o\right)},3249 - 60 \operatorname{re}{\left(o\right)} \right)}}{2} \right)}}{12} + \frac{\sqrt[4]{\left(3249 - 60 \operatorname{re}{\left(o\right)}\right)^{2} + 3600 \left(\operatorname{im}{\left(o\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- 60 \operatorname{im}{\left(o\right)},3249 - 60 \operatorname{re}{\left(o\right)} \right)}}{2} \right)}}{12} + \frac{13}{4}\right)$$
=
      5*re(o)   5*I*im(o)
-12 + ------- + ---------
         12         12   
$$\frac{5 \operatorname{re}{\left(o\right)}}{12} + \frac{5 i \operatorname{im}{\left(o\right)}}{12} - 12$$
-12 + 5*re(o)/12 + 5*i*im(o)/12