Encontrando los coeficientes " $b$ " desconocidos de trinomios en forma $ax^{2} + bx + c$

Now Playing:Es solve complex polynomials with unknown b – Example 1a

Determina los coeficientes k de los siguientes trinomios:
1. ${2x^2+kx-5}$
2. ${3x^2+kx+4}$

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Encontrando los coeficientes "bbb" desconocidos de trinomios en forma ax2+bx+cax^{2} + bx + cax2+bx+c