Welcome to Westonci.ca, where you can find answers to all your questions from a community of experienced professionals. Discover comprehensive answers to your questions from knowledgeable professionals on our user-friendly platform. Explore comprehensive solutions to your questions from knowledgeable professionals across various fields on our platform.

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).
Thank you for choosing our platform. We're dedicated to providing the best answers for all your questions. Visit us again. We appreciate your time. Please come back anytime for the latest information and answers to your questions. Your questions are important to us at Westonci.ca. Visit again for expert answers and reliable information.