Math Problem Statement

why is ln(1/4)=-2x the same as ln4

Solution

The equation ln(14)=2x\ln \left( \frac{1}{4} \right) = -2x being the same as ln4\ln 4 involves an understanding of logarithmic properties. Here’s a step-by-step breakdown:

  1. Start with the original equation: ln(14)=2x\ln \left( \frac{1}{4} \right) = -2x

  2. Rewrite ln(14)\ln \left( \frac{1}{4} \right) using the property of logarithms that allows us to express it as: ln(14)=ln(41)=ln(4)\ln \left( \frac{1}{4} \right) = \ln(4^{-1}) = -\ln(4) So the equation becomes: ln(4)=2x-\ln(4) = -2x

  3. Divide both sides by 1-1 to simplify: ln(4)=2x\ln(4) = 2x

  4. Now, divide by 22 to solve for xx: x=ln(4)2x = \frac{\ln(4)}{2}

This shows that the equation ln(14)=2x\ln \left( \frac{1}{4} \right) = -2x ultimately implies that x=ln(4)2x = \frac{\ln(4)}{2}.

Would you like more details on any of these steps?


Here are 5 questions related to this topic:

  1. What properties of logarithms are used to solve equations like ln(14)=2x\ln \left( \frac{1}{4} \right) = -2x?
  2. How would you solve an equation involving logarithms with different bases, like log2(8)=3x\log_2(8) = 3x?
  3. What are some other ways to simplify expressions with fractions in logarithms?
  4. How does solving logarithmic equations compare with solving exponential equations?
  5. What is the general formula for changing the base of a logarithm?

Tip: Remember, ln(1a)=ln(a)\ln \left( \frac{1}{a} \right) = -\ln(a) is a useful property for simplifying expressions.

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Math Problem Analysis

Mathematical Concepts

Logarithms
Properties of Logarithms

Formulas

ln(a/b) = ln(a) - ln(b)
ln(1/a) = -ln(a)

Theorems

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Suitable Grade Level

Grades 9-12