Math Problem Statement

Find the value of x, when log3 x + log3 10 = log3 5 + log3 6 - log3 2

Solution

To solve for xx in the equation

log3x+log310=log35+log36log32,\log_3 x + \log_3 10 = \log_3 5 + \log_3 6 - \log_3 2,

we can use the properties of logarithms to simplify and solve the equation.

Step 1: Use the property logab+logac=loga(bc)\log_a b + \log_a c = \log_a (bc)

First, apply the property to combine the logarithms on each side:

log3(x10)=log3(56)log32\log_3 (x \cdot 10) = \log_3 (5 \cdot 6) - \log_3 2

This simplifies to:

log3(10x)=log3(30)log32\log_3 (10x) = \log_3 (30) - \log_3 2

Step 2: Use the property logablogac=loga(bc)\log_a b - \log_a c = \log_a \left(\frac{b}{c}\right)

Now, apply the property to the right side of the equation:

log3(10x)=log3(302)\log_3 (10x) = \log_3 \left(\frac{30}{2}\right)

Simplifying the fraction:

log3(10x)=log3(15)\log_3 (10x) = \log_3 (15)

Step 3: Since log3a=log3ba=b\log_3 a = \log_3 b \Rightarrow a = b

We now have:

10x=1510x = 15

Step 4: Solve for xx

Divide both sides by 10:

x=1510=1.5x = \frac{15}{10} = 1.5

So, the value of xx is 1.5\boxed{1.5}.

Would you like more details or have any questions? Here are some related problems you might find useful:

  1. Solve log2(x+3)+log2(x1)=3\log_2 (x + 3) + \log_2 (x - 1) = 3.
  2. Find xx if log4x+log4(x1)=1\log_4 x + \log_4 (x - 1) = 1.
  3. Solve log5(2x+3)=2log5(x1)\log_5 (2x + 3) = 2 - \log_5 (x - 1).
  4. Determine xx for log3(x24)=2\log_3 (x^2 - 4) = 2.
  5. If log2(3x+1)=log2(x+5)\log_2 (3x + 1) = \log_2 (x + 5), find xx.

Tip: Remember that the properties of logarithms can greatly simplify complex logarithmic equations, making them easier to solve.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Logarithms
Algebra

Formulas

log_a b + log_a c = log_a (bc)
log_a b - log_a c = log_a (b/c)

Theorems

Logarithmic properties
Equality of logarithms

Suitable Grade Level

Grades 9-12