Evans Ingram
12/12/2023 · Senior High School
Resolver en \( \mathbb{R} \), indicando el dominio respectivo: \( \begin{array}{ll}\text { (a) }-2 x^{2}-2 x<4\left(-3-\frac{x}{2}\right) & \text { (b) } \frac{3}{4 x-8} \geq \frac{x}{x-2}\end{array} \)
UpStudy ThothAI Solution
Tutor-Verified Answer
Step-by-step Solution
Claro, aquí tienes las soluciones para los problemas dados:
### (a) \( -2x^2 - 2x < 4\left(-3 - \frac{x}{2}\right) \)
1. **Expande y reordena:**
\[
-2x^2 - 2x < -12 - 2x
\]
2. **Simplifica:**
\[
-2x^2 < -12
\]
3. **Divide por -2 (recuerda cambiar el signo):**
\[
x^2 > 6
\]
4. **Raíz cuadrada:**
\[
x > \sqrt{6} \quad \text{o} \quad x < -\sqrt{6}
\]
5. **Dominio:**
\[
(-\infty, -\sqrt{6}) \cup (\sqrt{6}, \infty)
\]
### (b) \( \frac{3}{4x - 8} \geq \frac{x}{x - 2} \)
1. **Encontrar el dominio:**
\[
4x - 8 \neq 0 \quad \text{y} \quad x - 2 \neq 0
\]
\[
x \neq 2 \quad \text{y} \quad x \neq 2
\]
2. **Multiplica por \( (4x - 8)(x - 2) \) (considerando el signo correcto):**
\[
3(x - 2) \geq x(4x - 8)
\]
3. **Expande y reordena:**
\[
3x - 6 \geq 4x^2 - 8x
\]
\[
4x^2 - 11x + 6 \leq 0
\]
4. **Factoriza:**
\[
(4x - 3)(x - 2) \leq 0
\]
5. **Encontrar los puntos críticos:**
\[
x = \frac{3}{4} \quad \text{y} \quad x = 2
\]
6. **Determinar el intervalo:**
\[
\frac{3}{4} \leq x \leq 2
\]
7. **Dominio:**
\[
\left[\frac{3}{4}, 2\right]
\]
Espero que esto te sea útil. ¡Buena suerte con tu estudio!
Quick Answer
### (a) \( -2x^2 - 2x < 4\left(-3 - \frac{x}{2}\right) \)
Dominio: \( (-\infty, -\sqrt{6}) \cup (\sqrt{6}, \infty) \)
### (b) \( \frac{3}{4x - 8} \geq \frac{x}{x - 2} \)
Dominio: \( \left[\frac{3}{4}, 2\right] \)
Answered by UpStudy AI and reviewed by a Professional Tutor
UpStudy ThothAI
Self-Developed and Ever-Improving
Thoth AI product is constantly being upgraded and optimized.
Covers All Major Subjects
Capable of handling homework in math, chemistry, biology, physics, and more.
Instant and Accurate
Provides immediate and precise solutions and guidance.
Try Now
Ask Tutors
Ask AI
10x
Fastest way to Get Answers & Solutions
By text
Enter your question here…
By image
Re-Upload
Submit