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2. El valor de \( k \) para que la ecuación: \( x^{2}-8 k x-9=0 \) tenga raices cuya suma sea igual a \( \frac{8}{3} \) \( \begin{array}{llll}\text { a) } 3 & \text { b) }-\frac{1}{3} & \text { c) } \frac{1}{3} & \text { d) }-3\end{array} \)

Ask by Davison Matthews. in Ecuador
Feb 04,2025

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El valor de \( k \) es \( \frac{1}{3} \).

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The Deep Dive

Para que la suma de las raíces de una ecuación cuadrática \( ax^2 + bx + c = 0 \) sea \( -\frac{b}{a} \), aplicamos esta fórmula a tu ecuación: \( a = 1 \), \( b = -8k \), y \( c = -9 \). Entonces, la suma de las raíces se convierte en \( \frac{8k}{1} = 8k \). Queremos que esta suma sea igual a \( \frac{8}{3} \), así que igualamos: \( 8k = \frac{8}{3} \). Resolviendo para \( k \), encontramos que \( k = \frac{1}{3} \). Así que la respuesta correcta es \( c) \frac{1}{3} \).

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