Math Problem Statement

please give a full explanation: \lim _{x\to 0+}\left(e^{\frac{lnxe}{x}}\right)

Solution

To evaluate the limit limx0+(eln(xe)x)\lim _{x\to 0^+}\left(e^{\frac{\ln(xe)}{x}}\right), let's follow these steps:

Step 1: Simplify the Expression Inside the Exponential

First, consider the expression inside the exponential function:

ln(xe)x\frac{\ln(xe)}{x}

Notice that ln(xe)\ln(xe) can be expanded using the logarithm properties:

ln(xe)=ln(x)+ln(e)\ln(xe) = \ln(x) + \ln(e)

Since ln(e)=1\ln(e) = 1, we have:

ln(xe)=ln(x)+1\ln(xe) = \ln(x) + 1

Thus, the expression inside the limit becomes:

ln(x)+1x\frac{\ln(x) + 1}{x}

So the limit can be rewritten as:

limx0+(eln(x)+1x)\lim _{x\to 0^+}\left(e^{\frac{\ln(x) + 1}{x}}\right)

Step 2: Analyze the Limit of the Exponent

Next, let's analyze the limit of the exponent ln(x)+1x\frac{\ln(x) + 1}{x} as x0+x \to 0^+:

limx0+ln(x)+1x\lim_{x \to 0^+} \frac{\ln(x) + 1}{x}

To understand this limit, break it into two parts:

limx0+ln(x)x+limx0+1x\lim_{x \to 0^+} \frac{\ln(x)}{x} + \lim_{x \to 0^+} \frac{1}{x}

Part 1: limx0+ln(x)x\lim_{x \to 0^+} \frac{\ln(x)}{x}

As x0+x \to 0^+, ln(x)\ln(x) approaches -\infty, and ln(x)x\frac{\ln(x)}{x} involves a -\infty term divided by a small positive xx. This term tends to -\infty:

limx0+ln(x)x=\lim_{x \to 0^+} \frac{\ln(x)}{x} = -\infty

Part 2: limx0+1x\lim_{x \to 0^+} \frac{1}{x}

As x0+x \to 0^+, 1x\frac{1}{x} grows without bound, meaning it tends to ++\infty:

limx0+1x=+\lim_{x \to 0^+} \frac{1}{x} = +\infty

Step 3: Combine the Results of Both Limits

Now, let's combine the two parts:

limx0+ln(x)x+limx0+1x=+\lim_{x \to 0^+} \frac{\ln(x)}{x} + \lim_{x \to 0^+} \frac{1}{x} = -\infty + \infty

This expression is an indeterminate form. However, considering that the 1x\frac{1}{x} term dominates (since ln(x)\ln(x) grows much more slowly compared to 1/x1/x as x0+x \to 0^+), the sum tends to ++\infty.

Step 4: Evaluate the Original Limit

Now that we know the exponent ln(x)+1x\frac{\ln(x) + 1}{x} tends to ++\infty as x0+x \to 0^+, we substitute this into the original limit:

limx0+(eln(xe)x)=e+\lim _{x\to 0^+}\left(e^{\frac{\ln(xe)}{x}}\right) = e^{+\infty}

Since e+e^{+\infty} grows without bound, the limit is:

limx0+(eln(xe)x)=\lim _{x\to 0^+}\left(e^{\frac{\ln(xe)}{x}}\right) = \boxed{\infty}

Conclusion

Thus, the limit evaluates to \infty as xx approaches 0+0^+.


Would you like to delve deeper into any part of this explanation? Here are some related questions to consider:

  1. How do you evaluate limx0+ln(x)x\lim _{x\to 0^+} \frac{\ln(x)}{x}?
  2. What are the different types of indeterminate forms in limits?
  3. How can L'Hôpital's Rule be applied to the limit limx0+ln(x)x\lim _{x\to 0^+} \frac{\ln(x)}{x}?
  4. What happens if you change the limit to limx0\lim _{x\to 0^-}?
  5. How do logarithms behave near 0 and near infinity?
  6. What is the limit limxln(x)x\lim _{x\to \infty} \frac{\ln(x)}{x}?
  7. How does the behavior of the function change if the base of the exponential is different?
  8. Can you analyze limx0+eln(x)x\lim _{x\to 0^+} e^{\frac{\ln(x)}{x}}?

Tip: When dealing with limits, especially involving logarithms and exponential functions, always consider if the expression is an indeterminate form before proceeding to simplify or apply limit laws.

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Math Problem Analysis

Mathematical Concepts

Limits
Exponential Functions
Logarithmic Functions
Indeterminate Forms

Formulas

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Theorems

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Suitable Grade Level

Advanced High School