Ryan Tyler
11/17/2023 · Middle School

NOMBRE Y APELLIDO: \( \begin{array}{ll}\text { a) } \lim _{x \rightarrow-4} \frac{x^{2}+3 x-4}{x^{2}+8 x+16} & \text { de } \lim _{x \rightarrow-\infty} \frac{x}{\sqrt{x^{2}+1}-1} \\ \text { b) } \lim _{x \rightarrow 2} \frac{\sqrt{2 x}-2}{x-2} & \text { e) } \lim _{x \rightarrow 1}\left(\frac{x}{2 x-1}\right)^{\frac{1}{x-1}} \\ \text { c) } \lim _{x \rightarrow \infty} \frac{x^{4}+x^{2}+3 x}{x^{3}+2 x-1} & \end{array} \)

UpStudy ThothAI Solution

Tutor-Verified Answer

Step-by-step Solution

Claro, aquí tienes las soluciones a los problemas de cálculo límite: a) Para calcular \(\lim _{x \rightarrow-4} \frac{x^{2}+3 x-4}{x^{2}+8 x+16}\), primero verificamos si la función está definida en \(x = -4\). La función está definida, por lo que podemos calcular el límite directamente sustituyendo \(x = -4\): \[ \lim _{x \rightarrow-4} \frac{x^{2}+3 x-4}{x^{2}+8 x+16} = \frac{(-4)^{2}+3(-4)-4}{(-4)^{2}+8(-4)+16} = \frac{16-12-4}{16-32+16} = \frac{0}{0} \] Este es un caso indeterminado de tipo \(\frac{0}{0}\), por lo que aplicamos L'Hôpital: \[ \lim _{x \rightarrow-4} \frac{2x+3}{2x+8} = \frac{2(-4)+3}{2(-4)+8} = \frac{-8+3}{-8+8} = \frac{-5}{0} \] Este es otro caso indeterminado de tipo \(\frac{\infty}{\infty}\), por lo que aplicamos L'Hôpital de nuevo: \[ \lim _{x \rightarrow-4} \frac{2}{2} = 1 \] Por lo tanto, \(\lim _{x \rightarrow-4} \frac{x^{2}+3 x-4}{x^{2}+8 x+16} = 1\). b) Para calcular \(\lim _{x \rightarrow-\infty} \frac{x}{\sqrt{x^{2}+1}-1}\), podemos usar la regla de la raíz cuadrada para simplificar la expresión: \[ \lim _{x \rightarrow-\infty} \frac{x}{\sqrt{x^{2}+1}-1} = \lim _{x \rightarrow-\infty} \frac{x}{x\left(\sqrt{1+\frac{1}{x^{2}}}-1\right)} = \lim _{x \rightarrow-\infty} \frac{1}{\sqrt{1+\frac{1}{x^{2}}}-1} \] Al tomar el límite, \(x\) se hace infinitamente grande, por lo que \(\frac{1}{x^{2}}\) se hace infinitamente pequeño y podemos usar el desarrollo de Taylor de \(\sqrt{1+u}\) para \(u\) muy pequeño: \[ \sqrt{1+u} \approx 1 + \frac{u}{2} \] Entonces, \[ \lim _{x \rightarrow-\infty} \frac{1}{\sqrt{1+\frac{1}{x^{2}}}-1} = \lim _{x \rightarrow-\infty} \frac{1}{\frac{1}{2x^{2}}} = \lim _{x \rightarrow-\infty} \frac{2x^{2}}{1} = -\infty \] Por lo tanto, \(\lim _{x \rightarrow-\infty} \frac{x}{\sqrt{x^{2}+1}-1} = -\infty\). c) Para calcular \(\lim _{x \rightarrow 2} \frac{\sqrt{2 x}-2}{x-2}\), podemos usar la regla de la raíz cuadrada para simplificar la expresión: \[ \lim _{x \rightarrow 2} \frac{\sqrt{2 x}-2}{x-2} = \lim _{x \rightarrow 2} \frac{\sqrt{2 x}-2}{x-2} \cdot \frac{\sqrt{2 x}+2}{\sqrt{2 x}+2} = \lim _{x \rightarrow 2} \frac{2 x-4}{(x-2)(\sqrt{2 x}+2)} \] Simplificamos la expresión: \[ \lim _{x \rightarrow 2} \frac{2(x-2)}{(x-2)(\sqrt{2 x}+2)} = \lim _{x \rightarrow 2} \frac{2}{\sqrt{2 x}+2} \] Sustituimos \(x = 2\): \[ \lim _{x \rightarrow 2} \frac{2}{\sqrt{2 x}+2} = \frac{2}{\sqrt{2 \cdot 2

Quick Answer

a) \(\lim _{x \rightarrow-4} \frac{x^{2}+3 x-4}{x^{2}+8 x+16} = 1\) b) \(\lim _{x \rightarrow-\infty} \frac{x}{\sqrt{x^{2}+1}-1} = -\infty\) c) \(\lim _{x \rightarrow 2} \frac{\sqrt{2 x}-2}{x-2} = \frac{2}{2} = 1\)
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
Uploaded Files
xxxx.png0%
Submit
📸 STUDY CAN BE A REAL STRUGGLE
Why Not UpStudy It?
Select your plan below
Premium

You can enjoy

  • Step-by-step explanations
  • 24/7 expert live tutors
  • Unlimited number of questions
  • No interruptions
  • Full access to answer and
    solution
  • Full Access to PDF Chat, UpStudy Chat, Browsing Chat
Basic
  • Limited Solutions