x^2*(5*i+3)+(15*i+25)*x+65*i=0 la ecuación
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Solución
Solución detallada
Abramos la expresión en la ecuación
( x 2 ( 3 + 5 i ) + x ( 25 + 15 i ) ) + 65 i = 0 \left(x^{2} \left(3 + 5 i\right) + x \left(25 + 15 i\right)\right) + 65 i = 0 ( x 2 ( 3 + 5 i ) + x ( 25 + 15 i ) ) + 65 i = 0 Obtenemos la ecuación cuadrática
3 x 2 + 5 i x 2 + 25 x + 15 i x + 65 i = 0 3 x^{2} + 5 i x^{2} + 25 x + 15 i x + 65 i = 0 3 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:
x 1 = D − b 2 a x_{1} = \frac{\sqrt{D} - b}{2 a} x 1 = 2 a D − b x 2 = − D − b 2 a x_{2} = \frac{- \sqrt{D} - b}{2 a} x 2 = 2 a − D − b donde D = b^2 - 4*a*c es el discriminante.
Como
a = 3 + 5 i a = 3 + 5 i a = 3 + 5 i b = 25 + 15 i b = 25 + 15 i b = 25 + 15 i c = 65 i c = 65 i c = 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
x 1 = ( 6 − 10 i ) ( − 25 − 15 i + − 65 i ( 12 + 20 i ) + ( 25 + 15 i ) 2 ) 136 x_{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} x 1 = 136 ( 6 − 10 i ) ( − 25 − 15 i + − 65 i ( 12 + 20 i ) + ( 25 + 15 i ) 2 ) x 2 = ( 6 − 10 i ) ( − 25 − 15 i − − 65 i ( 12 + 20 i ) + ( 25 + 15 i ) 2 ) 136 x_{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} x 2 = 136 ( 6 − 10 i ) ( − 25 − 15 i − − 65 i ( 12 + 20 i ) + ( 25 + 15 i ) 2 )
Teorema de Cardano-Vieta
reescribamos la ecuación
( x 2 ( 3 + 5 i ) + x ( 25 + 15 i ) ) + 65 i = 0 \left(x^{2} \left(3 + 5 i\right) + x \left(25 + 15 i\right)\right) + 65 i = 0 ( x 2 ( 3 + 5 i ) + x ( 25 + 15 i ) ) + 65 i = 0 de
a x 2 + b x + c = 0 a x^{2} + b x + c = 0 a x 2 + b x + c = 0 como ecuación cuadrática reducida
x 2 + b x a + c a = 0 x^{2} + \frac{b x}{a} + \frac{c}{a} = 0 x 2 + a b x + a c = 0 ( 3 − 5 i ) ( x 2 ( 3 + 5 i ) + x ( 25 + 15 i ) + 65 i ) 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 34 ( 3 − 5 i ) ( x 2 ( 3 + 5 i ) + x ( 25 + 15 i ) + 65 i ) = 0 p x + q + x 2 = 0 p x + q + x^{2} = 0 p x + q + x 2 = 0 donde
p = b a p = \frac{b}{a} p = a b p = ( 3 − 5 i ) ( 25 + 15 i ) 34 p = \frac{\left(3 - 5 i\right) \left(25 + 15 i\right)}{34} p = 34 ( 3 − 5 i ) ( 25 + 15 i ) q = c a q = \frac{c}{a} q = a c q = 65 i ( 3 − 5 i ) 34 q = \frac{65 i \left(3 - 5 i\right)}{34} q = 34 65 i ( 3 − 5 i ) Fórmulas de Cardano-Vieta
x 1 + x 2 = − p x_{1} + x_{2} = - p x 1 + x 2 = − p x 1 x 2 = q x_{1} x_{2} = q x 1 x 2 = q x 1 + x 2 = − ( 3 − 5 i ) ( 25 + 15 i ) 34 x_{1} + x_{2} = - \frac{\left(3 - 5 i\right) \left(25 + 15 i\right)}{34} x 1 + x 2 = − 34 ( 3 − 5 i ) ( 25 + 15 i ) x 1 x 2 = 65 i ( 3 − 5 i ) 34 x_{1} x_{2} = \frac{65 i \left(3 - 5 i\right)}{34} x 1 x 2 = 34 65 i ( 3 − 5 i )
/ ____ 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
x 1 = − 75 34 − 5 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + 3 10 28909 4 cos ( atan ( 3 170 ) 2 ) 68 + i ( − 5 10 28909 4 cos ( atan ( 3 170 ) 2 ) 68 − 3 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + 20 17 ) 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) x 1 = − 34 75 − 68 5 10 4 28909 sin ( 2 atan ( 170 3 ) ) + 68 3 10 4 28909 cos ( 2 atan ( 170 3 ) ) + i − 68 5 10 4 28909 cos ( 2 atan ( 170 3 ) ) − 68 3 10 4 28909 sin ( 2 atan ( 170 3 ) ) + 17 20
/ ____ 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
x 2 = − 75 34 − 3 10 28909 4 cos ( atan ( 3 170 ) 2 ) 68 + 5 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + i ( 3 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + 20 17 + 5 10 28909 4 cos ( atan ( 3 170 ) 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) x 2 = − 34 75 − 68 3 10 4 28909 cos ( 2 atan ( 170 3 ) ) + 68 5 10 4 28909 sin ( 2 atan ( 170 3 ) ) + i 68 3 10 4 28909 sin ( 2 atan ( 170 3 ) ) + 17 20 + 68 5 10 4 28909 cos ( 2 atan ( 170 3 ) )
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]
/ ____ 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
( − 75 34 − 5 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + 3 10 28909 4 cos ( atan ( 3 170 ) 2 ) 68 + i ( − 5 10 28909 4 cos ( atan ( 3 170 ) 2 ) 68 − 3 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + 20 17 ) ) + ( − 75 34 − 3 10 28909 4 cos ( atan ( 3 170 ) 2 ) 68 + 5 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + i ( 3 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + 20 17 + 5 10 28909 4 cos ( atan ( 3 170 ) 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) − 34 75 − 68 5 10 4 28909 sin ( 2 atan ( 170 3 ) ) + 68 3 10 4 28909 cos ( 2 atan ( 170 3 ) ) + i − 68 5 10 4 28909 cos ( 2 atan ( 170 3 ) ) − 68 3 10 4 28909 sin ( 2 atan ( 170 3 ) ) + 17 20 + − 34 75 − 68 3 10 4 28909 cos ( 2 atan ( 170 3 ) ) + 68 5 10 4 28909 sin ( 2 atan ( 170 3 ) ) + i 68 3 10 4 28909 sin ( 2 atan ( 170 3 ) ) + 17 20 + 68 5 10 4 28909 cos ( 2 atan ( 170 3 ) )
/ ____ 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 /
− 75 17 + i ( − 5 10 28909 4 cos ( atan ( 3 170 ) 2 ) 68 − 3 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + 20 17 ) + i ( 3 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + 20 17 + 5 10 28909 4 cos ( atan ( 3 170 ) 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) − 17 75 + i − 68 5 10 4 28909 cos ( 2 atan ( 170 3 ) ) − 68 3 10 4 28909 sin ( 2 atan ( 170 3 ) ) + 17 20 + i 68 3 10 4 28909 sin ( 2 atan ( 170 3 ) ) + 17 20 + 68 5 10 4 28909 cos ( 2 atan ( 170 3 ) )
/ / ____ 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 /
( − 75 34 − 5 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + 3 10 28909 4 cos ( atan ( 3 170 ) 2 ) 68 + i ( − 5 10 28909 4 cos ( atan ( 3 170 ) 2 ) 68 − 3 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + 20 17 ) ) ( − 75 34 − 3 10 28909 4 cos ( atan ( 3 170 ) 2 ) 68 + 5 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + i ( 3 10 28909 4 sin ( atan ( 3 170 ) 2 ) 68 + 20 17 + 5 10 28909 4 cos ( atan ( 3 170 ) 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) − 34 75 − 68 5 10 4 28909 sin ( 2 atan ( 170 3 ) ) + 68 3 10 4 28909 cos ( 2 atan ( 170 3 ) ) + i − 68 5 10 4 28909 cos ( 2 atan ( 170 3 ) ) − 68 3 10 4 28909 sin ( 2 atan ( 170 3 ) ) + 17 20 − 34 75 − 68 3 10 4 28909 cos ( 2 atan ( 170 3 ) ) + 68 5 10 4 28909 sin ( 2 atan ( 170 3 ) ) + i 68 3 10 4 28909 sin ( 2 atan ( 170 3 ) ) + 17 20 + 68 5 10 4 28909 cos ( 2 atan ( 170 3 ) )
325 195*I
--- + -----
34 34
325 34 + 195 i 34 \frac{325}{34} + \frac{195 i}{34} 34 325 + 34 195 i
x1 = -3.9982211317292 + 4.22433343247952*i
x2 = -0.413543574153153 - 1.87139225600893*i
x2 = -0.413543574153153 - 1.87139225600893*i