Math Problem Statement

log_2 3 × log_3 4 × log_4 5 × ... × log_x (x + 1) = 10

Solution

The equation given is:

log23×log34×log45××logx(x+1)=10\log_2 3 \times \log_3 4 \times \log_4 5 \times \dots \times \log_x (x+1) = 10

To simplify this expression, we can use the change of base property of logarithms, which states:

logab=logbloga\log_a b = \frac{\log b}{\log a}

By applying this rule to each term, we get:

log23=log3log2,log34=log4log3,log45=log5log4,,logx(x+1)=log(x+1)logx\log_2 3 = \frac{\log 3}{\log 2}, \quad \log_3 4 = \frac{\log 4}{\log 3}, \quad \log_4 5 = \frac{\log 5}{\log 4}, \dots, \quad \log_x (x+1) = \frac{\log (x+1)}{\log x}

Now, the full product becomes:

log3log2×log4log3×log5log4××log(x+1)logx\frac{\log 3}{\log 2} \times \frac{\log 4}{\log 3} \times \frac{\log 5}{\log 4} \times \dots \times \frac{\log (x+1)}{\log x}

Notice that most of the terms cancel out in a telescoping manner, leaving us with:

log(x+1)log2\frac{\log (x+1)}{\log 2}

Now, the equation simplifies to:

log(x+1)log2=10\frac{\log (x+1)}{\log 2} = 10

Multiplying both sides by log2\log 2, we have:

log(x+1)=10log2\log (x+1) = 10 \cdot \log 2

Since log2\log 2 is a constant (approximately 0.30100.3010), we can calculate:

log(x+1)=10×0.3010=3.010\log (x+1) = 10 \times 0.3010 = 3.010

Now, exponentiating both sides (since we are dealing with a logarithmic equation), we get:

x+1=103.010x+1 = 10^{3.010}

Calculating 103.01010^{3.010}:

x+11024x+1 \approx 1024

Therefore:

x1023x \approx 1023

Thus, the solution to the equation is x=1023x = 1023.


Would you like more details on any step, or do you have any questions?

Here are five related questions:

  1. How does the change of base formula work for logarithms?
  2. What is the meaning of a telescoping product?
  3. How can logarithmic equations be solved by converting them to exponential form?
  4. Why does the product of logarithms cancel out in this problem?
  5. How can we use logarithmic properties to simplify more complex expressions?

Tip: Always look for patterns like telescoping in product or sum expressions to simplify logarithmic equations more easily.

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Math Problem Analysis

Mathematical Concepts

Logarithms
Change of Base Formula
Telescoping Products

Formulas

log_a b = log b / log a
Telescoping: log_x(x+1)

Theorems

Change of Base Formula
Exponential Property of Logarithms

Suitable Grade Level

Grades 11-12