Math Problem Statement

Show clearly that log_4 36 + (1/2)log_4 256 - 2log_4 48 = -log_4 4.

Solution

Let's break down the given equation step by step and prove that:

log436+12log42562log448=log44\log_4 36 + \frac{1}{2} \log_4 256 - 2 \log_4 48 = -\log_4 4

Step 1: Simplify the logarithmic terms individually

We'll use properties of logarithms such as:

  • logb(mn)=logbm+logbn\log_b (mn) = \log_b m + \log_b n
  • logb(m/n)=logbmlogbn\log_b (m/n) = \log_b m - \log_b n
  • logb(mp)=plogbm\log_b (m^p) = p \log_b m

Term 1: log436\log_4 36

Leave as is for now: log436\log_4 36.

Term 2: 12log4256\frac{1}{2} \log_4 256

Use the power rule: 12log4256=log4(2561/2)=log416\frac{1}{2} \log_4 256 = \log_4 (256^{1/2}) = \log_4 16.

Term 3: 2log4482 \log_4 48

Use the power rule: 2log448=log4(482)=log423042 \log_4 48 = \log_4 (48^2) = \log_4 2304.

Step 2: Substitute and simplify the equation

The equation now becomes: log436+log416log42304=log44\log_4 36 + \log_4 16 - \log_4 2304 = -\log_4 4

Step 3: Combine the logarithms using addition and subtraction rules

Use the logarithmic rule logbm+logbn=logb(mn)\log_b m + \log_b n = \log_b (m \cdot n) and logbmlogbn=logb(mn)\log_b m - \log_b n = \log_b \left( \frac{m}{n} \right).

log4(36×16)log42304=log44\log_4 \left( 36 \times 16 \right) - \log_4 2304 = -\log_4 4 log4576log42304=log44\log_4 576 - \log_4 2304 = -\log_4 4

Now apply the subtraction rule: log4(5762304)=log44\log_4 \left( \frac{576}{2304} \right) = -\log_4 4 Simplify the fraction 5762304=14\frac{576}{2304} = \frac{1}{4}, so we get: log4(14)=log44\log_4 \left( \frac{1}{4} \right) = -\log_4 4

Step 4: Solve the logarithms

Since log4(14)=log441=log44\log_4 \left( \frac{1}{4} \right) = \log_4 4^{-1} = -\log_4 4, we have: log44=log44-\log_4 4 = -\log_4 4

Thus, both sides are equal, proving the equation is correct.

Conclusion:

log436+12log42562log448=log44\log_4 36 + \frac{1}{2} \log_4 256 - 2 \log_4 48 = -\log_4 4

Do you want any further clarification or details?

Here are 5 related questions you might consider:

  1. How do we handle logarithms with different bases?
  2. What is the change of base formula for logarithms?
  3. How can logarithmic identities simplify complex expressions?
  4. What are the real-world applications of logarithmic functions?
  5. How does the relationship between exponents and logarithms work?

Tip: Always keep logarithmic properties handy, such as the product, quotient, and power rules. They help simplify expressions efficiently.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Logarithms
Logarithmic Properties
Algebra

Formulas

log_b(m^p) = p * log_b(m)
log_b(m/n) = log_b(m) - log_b(n)
log_b(m * n) = log_b(m) + log_b(n)

Theorems

Properties of Logarithms

Suitable Grade Level

Grades 10-12