Math Problem Statement

3x3^{x}= 8 $$$$

Solution

To solve the equation 3x=83^x = 8, we need to find the value of xx.

Since 8 is not a power of 3, we can solve this equation using logarithms. Here are the steps:

  1. Take the natural logarithm (or logarithm to any base) of both sides: ln(3x)=ln(8)\ln(3^x) = \ln(8)

  2. Use the power rule of logarithms, which states ln(ab)=bln(a)\ln(a^b) = b \ln(a): xln(3)=ln(8)x \ln(3) = \ln(8)

  3. Solve for xx: x=ln(8)ln(3)x = \frac{\ln(8)}{\ln(3)}

Using a calculator to find the natural logarithms:

  • ln(8)2.0794\ln(8) \approx 2.0794
  • ln(3)1.0986\ln(3) \approx 1.0986

Therefore, x2.07941.09861.8928x \approx \frac{2.0794}{1.0986} \approx 1.8928

So, the value of xx that satisfies 3x=83^x = 8 is approximately 1.89281.8928.

Would you like more details or have any questions?

Here are some related questions to explore:

  1. What is the general method for solving exponential equations?
  2. How can we solve 2x=102^x = 10?
  3. How do logarithms help in solving exponential equations?
  4. What is the relationship between logarithms and exponents?
  5. Can we use a different logarithm base to solve 3x=83^x = 8?
  6. How would you solve 3x=83^x = 8 using common logarithms (base 10)?
  7. What are some real-life applications of solving exponential equations?
  8. What are the properties of logarithms that are useful in solving equations?

Tip: Remember that logarithms are powerful tools for solving equations involving exponential expressions, and understanding their properties can greatly simplify complex calculations.

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Math Problem Analysis

Mathematical Concepts

Exponential Functions
Logarithms

Formulas

Exponential function: a^x
Logarithm: log(a)

Theorems

Power rule of logarithms

Suitable Grade Level

Grades 10-12