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13. Al resolver:

[tex]\[
(2k-1)x + 4(x-k) = 3
\][/tex]

Se obtuvo como solución [tex]\( x = -2 \)[/tex]. Determina el valor de [tex]\( k \)[/tex].

a) [tex]\( -\frac{3}{4} \)[/tex]
b) [tex]\( -\frac{9}{8} \)[/tex]
c) [tex]\( -\frac{8}{9} \)[/tex]
d) [tex]\( \frac{3}{4} \)[/tex]
e) [tex]\( \frac{8}{9} \)[/tex]


Sagot :

Para determinar el valor de [tex]\( k \)[/tex] que satisface la ecuación [tex]\((2k - 1)x + 4(x - k) = 3\)[/tex] cuando [tex]\( x = -2 \)[/tex], sigamos el siguiente procedimiento paso a paso:

1. Sustituir [tex]\( x = -2 \)[/tex] en la ecuación:

[tex]\[ (2k - 1)(-2) + 4(-2 - k) = 3 \][/tex]

2. Distribuir en ambos términos:

[tex]\[ (-2)(2k - 1) + 4(-2 - k) = 3 \][/tex]

3. Expandir los productos:

[tex]\[ -2 \cdot 2k + (-2) \cdot (-1) + 4 \cdot (-2) + 4 \cdot (-k) = 3 \][/tex]

4. Simplificar cada término:

[tex]\[ -4k + 2 - 8 - 4k = 3 \][/tex]

5. Combinar términos semejantes:

[tex]\[ -4k - 4k + 2 - 8 = 3 \][/tex]

[tex]\[ -8k - 6 = 3 \][/tex]

6. Aislar el término que contiene [tex]\( k \)[/tex]:

[tex]\[ -8k = 3 + 6 \][/tex]

[tex]\[ -8k = 9 \][/tex]

7. Despejar [tex]\( k \)[/tex]:

[tex]\[ k = \frac{9}{-8} \][/tex]

[tex]\[ k = -\frac{9}{8} \][/tex]

Por lo tanto, el valor de [tex]\( k \)[/tex] que satisface la ecuación es [tex]\( k = -\frac{9}{8} \)[/tex]. La respuesta correcta es la opción:

b) [tex]\(-\frac{9}{8}\)[/tex]
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