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x^2*(5*i+3)+(15*i+25)*x+65*i=0 la ecuación

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Solución

Ha introducido [src]
 2                                     
x *(5*I + 3) + (15*I + 25)*x + 65*I = 0
(x2(3+5i)+x(25+15i))+65i=0\left(x^{2} \left(3 + 5 i\right) + x \left(25 + 15 i\right)\right) + 65 i = 0
Solución detallada
Abramos la expresión en la ecuación
(x2(3+5i)+x(25+15i))+65i=0\left(x^{2} \left(3 + 5 i\right) + x \left(25 + 15 i\right)\right) + 65 i = 0
Obtenemos la ecuación cuadrática
3x2+5ix2+25x+15ix+65i=03 x^{2} + 5 i x^{2} + 25 x + 15 i x + 65 i = 0
Es la ecuación de la forma
a*x^2 + b*x + c = 0

La ecuación cuadrática puede ser resuelta
con la ayuda del discriminante.
Las raíces de la ecuación cuadrática:
x1=Db2ax_{1} = \frac{\sqrt{D} - b}{2 a}
x2=Db2ax_{2} = \frac{- \sqrt{D} - b}{2 a}
donde D = b^2 - 4*a*c es el discriminante.
Como
a=3+5ia = 3 + 5 i
b=25+15ib = 25 + 15 i
c=65ic = 65 i
, entonces
D = b^2 - 4 * a * c = 

(25 + 15*i)^2 - 4 * (3 + 5*i) * (65*i) = (25 + 15*i)^2 - 65*i*(12 + 20*i)

La ecuación tiene dos raíces.
x1 = (-b + sqrt(D)) / (2*a)

x2 = (-b - sqrt(D)) / (2*a)

o
x1=(610i)(2515i+65i(12+20i)+(25+15i)2)136x_{1} = \frac{\left(6 - 10 i\right) \left(-25 - 15 i + \sqrt{- 65 i \left(12 + 20 i\right) + \left(25 + 15 i\right)^{2}}\right)}{136}
x2=(610i)(2515i65i(12+20i)+(25+15i)2)136x_{2} = \frac{\left(6 - 10 i\right) \left(-25 - 15 i - \sqrt{- 65 i \left(12 + 20 i\right) + \left(25 + 15 i\right)^{2}}\right)}{136}
Teorema de Cardano-Vieta
reescribamos la ecuación
(x2(3+5i)+x(25+15i))+65i=0\left(x^{2} \left(3 + 5 i\right) + x \left(25 + 15 i\right)\right) + 65 i = 0
de
ax2+bx+c=0a x^{2} + b x + c = 0
como ecuación cuadrática reducida
x2+bxa+ca=0x^{2} + \frac{b x}{a} + \frac{c}{a} = 0
(35i)(x2(3+5i)+x(25+15i)+65i)34=0\frac{\left(3 - 5 i\right) \left(x^{2} \left(3 + 5 i\right) + x \left(25 + 15 i\right) + 65 i\right)}{34} = 0
px+q+x2=0p x + q + x^{2} = 0
donde
p=bap = \frac{b}{a}
p=(35i)(25+15i)34p = \frac{\left(3 - 5 i\right) \left(25 + 15 i\right)}{34}
q=caq = \frac{c}{a}
q=65i(35i)34q = \frac{65 i \left(3 - 5 i\right)}{34}
Fórmulas de Cardano-Vieta
x1+x2=px_{1} + x_{2} = - p
x1x2=qx_{1} x_{2} = q
x1+x2=(35i)(25+15i)34x_{1} + x_{2} = - \frac{\left(3 - 5 i\right) \left(25 + 15 i\right)}{34}
x1x2=65i(35i)34x_{1} x_{2} = \frac{65 i \left(3 - 5 i\right)}{34}
Gráfica
Respuesta rápida [src]
              /         ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\\       ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\
              |     5*\/ 10 *\/ 28909 *cos|-----------|   3*\/ 10 *\/ 28909 *sin|-----------||   5*\/ 10 *\/ 28909 *sin|-----------|   3*\/ 10 *\/ 28909 *cos|-----------|
       75     |20                         \     2     /                         \     2     /|                         \     2     /                         \     2     /
x1 = - -- + I*|-- - ----------------------------------- - -----------------------------------| - ----------------------------------- + -----------------------------------
       34     \17                    68                                    68                /                    68                                    68                
x1=7534510289094sin(atan(3170)2)68+310289094cos(atan(3170)2)68+i(510289094cos(atan(3170)2)68310289094sin(atan(3170)2)68+2017)x_{1} = - \frac{75}{34} - \frac{5 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{3 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + i \left(- \frac{5 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} - \frac{3 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{20}{17}\right)
              /         ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\\       ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\
              |     3*\/ 10 *\/ 28909 *sin|-----------|   5*\/ 10 *\/ 28909 *cos|-----------||   3*\/ 10 *\/ 28909 *cos|-----------|   5*\/ 10 *\/ 28909 *sin|-----------|
       75     |20                         \     2     /                         \     2     /|                         \     2     /                         \     2     /
x2 = - -- + I*|-- + ----------------------------------- + -----------------------------------| - ----------------------------------- + -----------------------------------
       34     \17                    68                                    68                /                    68                                    68                
x2=7534310289094cos(atan(3170)2)68+510289094sin(atan(3170)2)68+i(310289094sin(atan(3170)2)68+2017+510289094cos(atan(3170)2)68)x_{2} = - \frac{75}{34} - \frac{3 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{5 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + i \left(\frac{3 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{20}{17} + \frac{5 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68}\right)
x2 = -75/34 - 3*sqrt(10)*28909^(1/4)*cos(atan(3/170)/2)/68 + 5*sqrt(10)*28909^(1/4)*sin(atan(3/170)/2)/68 + i*(3*sqrt(10)*28909^(1/4)*sin(atan(3/170)/2)/68 + 20/17 + 5*sqrt(10)*28909^(1/4)*cos(atan(3/170)/2)/68)
Suma y producto de raíces [src]
suma
         /         ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\\       ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\            /         ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\\       ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\
         |     5*\/ 10 *\/ 28909 *cos|-----------|   3*\/ 10 *\/ 28909 *sin|-----------||   5*\/ 10 *\/ 28909 *sin|-----------|   3*\/ 10 *\/ 28909 *cos|-----------|            |     3*\/ 10 *\/ 28909 *sin|-----------|   5*\/ 10 *\/ 28909 *cos|-----------||   3*\/ 10 *\/ 28909 *cos|-----------|   5*\/ 10 *\/ 28909 *sin|-----------|
  75     |20                         \     2     /                         \     2     /|                         \     2     /                         \     2     /     75     |20                         \     2     /                         \     2     /|                         \     2     /                         \     2     /
- -- + I*|-- - ----------------------------------- - -----------------------------------| - ----------------------------------- + ----------------------------------- + - -- + I*|-- + ----------------------------------- + -----------------------------------| - ----------------------------------- + -----------------------------------
  34     \17                    68                                    68                /                    68                                    68                     34     \17                    68                                    68                /                    68                                    68                
(7534510289094sin(atan(3170)2)68+310289094cos(atan(3170)2)68+i(510289094cos(atan(3170)2)68310289094sin(atan(3170)2)68+2017))+(7534310289094cos(atan(3170)2)68+510289094sin(atan(3170)2)68+i(310289094sin(atan(3170)2)68+2017+510289094cos(atan(3170)2)68))\left(- \frac{75}{34} - \frac{5 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{3 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + i \left(- \frac{5 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} - \frac{3 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{20}{17}\right)\right) + \left(- \frac{75}{34} - \frac{3 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{5 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + i \left(\frac{3 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{20}{17} + \frac{5 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68}\right)\right)
=
         /         ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\\     /         ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\\
         |     5*\/ 10 *\/ 28909 *cos|-----------|   3*\/ 10 *\/ 28909 *sin|-----------||     |     3*\/ 10 *\/ 28909 *sin|-----------|   5*\/ 10 *\/ 28909 *cos|-----------||
  75     |20                         \     2     /                         \     2     /|     |20                         \     2     /                         \     2     /|
- -- + I*|-- - ----------------------------------- - -----------------------------------| + I*|-- + ----------------------------------- + -----------------------------------|
  17     \17                    68                                    68                /     \17                    68                                    68                /
7517+i(510289094cos(atan(3170)2)68310289094sin(atan(3170)2)68+2017)+i(310289094sin(atan(3170)2)68+2017+510289094cos(atan(3170)2)68)- \frac{75}{17} + i \left(- \frac{5 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} - \frac{3 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{20}{17}\right) + i \left(\frac{3 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{20}{17} + \frac{5 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68}\right)
producto
/         /         ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\\       ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\\ /         /         ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\\       ____ 4 _______    /atan(3/170)\       ____ 4 _______    /atan(3/170)\\
|         |     5*\/ 10 *\/ 28909 *cos|-----------|   3*\/ 10 *\/ 28909 *sin|-----------||   5*\/ 10 *\/ 28909 *sin|-----------|   3*\/ 10 *\/ 28909 *cos|-----------|| |         |     3*\/ 10 *\/ 28909 *sin|-----------|   5*\/ 10 *\/ 28909 *cos|-----------||   3*\/ 10 *\/ 28909 *cos|-----------|   5*\/ 10 *\/ 28909 *sin|-----------||
|  75     |20                         \     2     /                         \     2     /|                         \     2     /                         \     2     /| |  75     |20                         \     2     /                         \     2     /|                         \     2     /                         \     2     /|
|- -- + I*|-- - ----------------------------------- - -----------------------------------| - ----------------------------------- + -----------------------------------|*|- -- + I*|-- + ----------------------------------- + -----------------------------------| - ----------------------------------- + -----------------------------------|
\  34     \17                    68                                    68                /                    68                                    68                / \  34     \17                    68                                    68                /                    68                                    68                /
(7534510289094sin(atan(3170)2)68+310289094cos(atan(3170)2)68+i(510289094cos(atan(3170)2)68310289094sin(atan(3170)2)68+2017))(7534310289094cos(atan(3170)2)68+510289094sin(atan(3170)2)68+i(310289094sin(atan(3170)2)68+2017+510289094cos(atan(3170)2)68))\left(- \frac{75}{34} - \frac{5 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{3 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + i \left(- \frac{5 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} - \frac{3 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{20}{17}\right)\right) \left(- \frac{75}{34} - \frac{3 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{5 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + i \left(\frac{3 \sqrt{10} \sqrt[4]{28909} \sin{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68} + \frac{20}{17} + \frac{5 \sqrt{10} \sqrt[4]{28909} \cos{\left(\frac{\operatorname{atan}{\left(\frac{3}{170} \right)}}{2} \right)}}{68}\right)\right)
=
325   195*I
--- + -----
 34     34 
32534+195i34\frac{325}{34} + \frac{195 i}{34}
325/34 + 195*i/34
Respuesta numérica [src]
x1 = -3.9982211317292 + 4.22433343247952*i
x2 = -0.413543574153153 - 1.87139225600893*i
x2 = -0.413543574153153 - 1.87139225600893*i