Math Problem Statement

solve

Evaluate the limit lim_{h→0} (7e^x - 7e^{x+h}) / 4h.

Solution

Since the user has uploaded an image, I will first use OCR to extract the mathematical expression from the image for further processing.

import pytesseract from PIL import Image

Load the image from the file path

img_path = "/mnt/data/1725505844832mngsyfdg.jpg" img = Image.open(img_path)

Use pytesseract to extract text

extracted_text = pytesseract.image_to_string(img) extracted_textThe image text extraction didn't work correctly. However, I can directly work with the image content you've provided. The limit in question is:

limh07ex7ex+h4h\lim_{{h \to 0}} \frac{7e^x - 7e^{x+h}}{4h}

Let's solve this limit step by step.

Step 1: Rewrite the expression

We know that ex+h=exehe^{x+h} = e^x \cdot e^h, so we can rewrite the limit as:

limh07ex7exeh4h\lim_{{h \to 0}} \frac{7e^x - 7e^x \cdot e^h}{4h}

Step 2: Factor out common terms

Factor out 7ex7e^x from the numerator:

limh07ex(1eh)4h\lim_{{h \to 0}} \frac{7e^x \left(1 - e^h\right)}{4h}

Step 3: Use the series expansion for ehe^h

For small hh, we know the series expansion for ehe^h is:

eh1+h+h22!+e^h \approx 1 + h + \frac{h^2}{2!} + \cdots

Substitute this into the limit expression:

limh07ex(1(1+h+h22!+))4h\lim_{{h \to 0}} \frac{7e^x \left(1 - \left(1 + h + \frac{h^2}{2!} + \cdots \right)\right)}{4h}

Simplify the numerator:

1(1+h+h22!+)=hh22!1 - \left(1 + h + \frac{h^2}{2!} + \cdots \right) = -h - \frac{h^2}{2!} - \cdots

Thus, the expression becomes:

limh07ex(hh22!)4h\lim_{{h \to 0}} \frac{7e^x \left(-h - \frac{h^2}{2!} - \cdots \right)}{4h}

Step 4: Simplify and evaluate the limit

Now, divide by hh:

limh07ex(h)4h=limh07ex4\lim_{{h \to 0}} \frac{7e^x \left(-h\right)}{4h} = \lim_{{h \to 0}} \frac{-7e^x}{4}

The higher-order terms vanish as h0h \to 0, leaving us with:

7ex4\boxed{\frac{-7e^x}{4}}

Thus, the value of the limit is 7ex4\frac{-7e^x}{4}.

Let me know if you'd like any further explanation or clarification!

Here are 5 questions you might want to explore next:

  1. How do higher-order terms affect limits involving exponential functions?
  2. What is the general form of the derivative of exe^x?
  3. How would the solution change if the limit involved cos(x)\cos(x) instead of exe^x?
  4. What does the series expansion for ehe^h tell us about small values of hh?
  5. How can L'Hopital's Rule be used to solve limits like this one?

Tip: When dealing with limits involving exponential functions, Taylor series expansions are a powerful tool for simplifying expressions around small values of the variable.

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Math Problem Analysis

Mathematical Concepts

Limits
Exponential Functions
Series Expansion
Calculus

Formulas

lim_{h→0} (7e^x - 7e^{x+h}) / 4h
e^{x+h} = e^x * e^h
e^h ≈ 1 + h + h^2 / 2! + ... (for small h)

Theorems

Taylor Series Expansion
Limit Definition of the Derivative

Suitable Grade Level

University Level - Calculus I