iz^3+3z^2+4iz+12=0 la ecuación
El profesor se sorprenderá mucho al ver tu solución correcta😉
Solución
Teorema de Cardano-Vieta
reescribamos la ecuación
$$\left(4 i z + \left(i z^{3} + 3 z^{2}\right)\right) + 12 = 0$$
de
$$a z^{3} + b z^{2} + c z + d = 0$$
como ecuación cúbica reducida
$$z^{3} + \frac{b z^{2}}{a} + \frac{c z}{a} + \frac{d}{a} = 0$$
$$- i \left(i z^{3} + 3 z^{2} + 4 i z + 12\right) = 0$$
$$p z^{2} + q z + v + z^{3} = 0$$
donde
$$p = \frac{b}{a}$$
$$p = - 3 i$$
$$q = \frac{c}{a}$$
$$q = 4$$
$$v = \frac{d}{a}$$
$$v = - 12 i$$
Fórmulas de Cardano-Vieta
$$z_{1} + z_{2} + z_{3} = - p$$
$$z_{1} z_{2} + z_{1} z_{3} + z_{2} z_{3} = q$$
$$z_{1} z_{2} z_{3} = v$$
$$z_{1} + z_{2} + z_{3} = 3 i$$
$$z_{1} z_{2} + z_{1} z_{3} + z_{2} z_{3} = 4$$
$$z_{1} z_{2} z_{3} = - 12 i$$
$$z_{1} = - 2 i$$
$$z_{2} = 2 i$$
$$z_{3} = 3 i$$
Suma y producto de raíces
[src]
$$\left(- 2 i + 2 i\right) + 3 i$$
$$3 i$$
$$3 i - 2 i 2 i$$
$$12 i$$