Math Problem Statement

Evaluate the limit: lim (x -> 0+) x^(ln(2) / (1 + ln(x))).

Solution

We need to evaluate the given limit:

limx0+xln21+lnx\lim_{x \to 0^+} x^{\frac{\ln 2}{1 + \ln x}}

Step 1: Simplify the exponent

The term xln21+lnxx^{\frac{\ln 2}{1 + \ln x}} can be rewritten using the property ab=eblnaa^{b} = e^{b \ln a}: xln21+lnx=eln21+lnxlnx.x^{\frac{\ln 2}{1 + \ln x}} = e^{\frac{\ln 2}{1 + \ln x} \ln x}.

So, the limit becomes: limx0+eln2lnx1+lnx.\lim_{x \to 0^+} e^{\frac{\ln 2 \cdot \ln x}{1 + \ln x}}.

Step 2: Analyze the exponent

Now focus on the exponent: ln2lnx1+lnx.\frac{\ln 2 \cdot \ln x}{1 + \ln x}.

As x0+x \to 0^+, lnx\ln x \to -\infty. Thus, analyze the denominator 1+lnx1 + \ln x, which also tends to -\infty. The behavior of the fraction needs closer inspection.

Simplify the fraction:

\frac{\ln 2 \cdot \ln x}{1 + \ln x} \approx \ln 2 \cdot \frac{\ln x}{\ln x} = \ln 2 \quad \text{(as x \to 0^+)}.

Step 3: Evaluate the limit

Thus, the exponent converges to a finite value: ln2lnx1+lnxln2.\frac{\ln 2 \cdot \ln x}{1 + \ln x} \to \ln 2.

Therefore, the limit becomes: eln2=2.e^{\ln 2} = 2.

Final Answer:

limx0+xln21+lnx=2.\lim_{x \to 0^+} x^{\frac{\ln 2}{1 + \ln x}} = 2.

Would you like a detailed breakdown of any step or further examples?

Here are 5 follow-up questions to deepen understanding:

  1. How does the property ab=eblnaa^b = e^{b \ln a} help in limit problems like this?
  2. Why does lnx\ln x \to -\infty as x0+x \to 0^+?
  3. What happens if the numerator of the exponent is more complex, such as lnxlnx\ln x \cdot \ln x?
  4. How would the solution change if ln2\ln 2 were replaced with another constant, like ln3\ln 3?
  5. What role does L’Hopital’s Rule play in problems involving limits of forms \frac{-\infty}{\infty}?

Tip: Always rewrite exponential expressions into their logarithmic form to simplify limits involving powers!

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Math Problem Analysis

Mathematical Concepts

Limits
Exponential and Logarithmic Functions
Asymptotic Behavior

Formulas

a^b = e^(b * ln(a))
Behavior of ln(x) as x -> 0+

Theorems

Properties of Exponents
Logarithmic Properties

Suitable Grade Level

Grade 12 / Early University