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Resuelve: [tex]\(7x^2 - 3x - 2 = 0\)[/tex] e indica la menor raíz.

a) [tex]\(\frac{3+\sqrt{65}}{14}\)[/tex]

b) [tex]\(\frac{3+\sqrt{15}}{14}\)[/tex]

c) [tex]\(\frac{3-\sqrt{65}}{7}\)[/tex]

d) [tex]\(\frac{3-\sqrt{15}}{14}\)[/tex]

e) [tex]\(\frac{3-\sqrt{65}}{14}\)[/tex]

Sagot :

Para resolver la ecuación cuadrática [tex]\(7x^2 - 3x - 2 = 0\)[/tex], comenzamos identificando los coeficientes de la ecuación cuadrática de la forma [tex]\(ax^2 + bx + c = 0\)[/tex]:

- [tex]\(a = 7\)[/tex]
- [tex]\(b = -3\)[/tex]
- [tex]\(c = -2\)[/tex]

Para encontrar las raíces de la ecuación, utilizamos la fórmula cuadrática:

[tex]\[ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \][/tex]

Primero, calculemos el discriminante ([tex]\(\Delta\)[/tex]):

[tex]\[ \Delta = b^2 - 4ac \][/tex]

Sustituimos los valores de [tex]\(a\)[/tex], [tex]\(b\)[/tex], y [tex]\(c\)[/tex]:

[tex]\[ \Delta = (-3)^2 - 4 \times 7 \times (-2) \][/tex]
[tex]\[ \Delta = 9 + 56 \][/tex]
[tex]\[ \Delta = 65 \][/tex]

Ahora utilizamos el valor del discriminante para encontrar las dos raíces:

[tex]\[ x_{1} = \frac{-b + \sqrt{\Delta}}{2a} \][/tex]
[tex]\[ x_{1} = \frac{-(-3) + \sqrt{65}}{2 \times 7} \][/tex]
[tex]\[ x_{1} = \frac{3 + \sqrt{65}}{14} \][/tex]

[tex]\[ x_{2} = \frac{-b - \sqrt{\Delta}}{2a} \][/tex]
[tex]\[ x_{2} = \frac{-(-3) - \sqrt{65}}{2 \times 7} \][/tex]
[tex]\[ x_{2} = \frac{3 - \sqrt{65}}{14} \][/tex]

Las raíces son:

[tex]\[ x_{1} = \frac{3 + \sqrt{65}}{14} \quad \text{y} \quad x_{2} = \frac{3 - \sqrt{65}}{14} \][/tex]

Entre estas dos raíces, la menor es [tex]\( \frac{3 - \sqrt{65}}{14} \)[/tex].

Finalmente, la respuesta correcta es:

[tex]\[ \boxed{\frac{3 - \sqrt{65}}{14}} \][/tex]

Por lo tanto, la opción correcta es la (e).