Math Problem Statement

solve log(3+x)-log(x-2)=log(2)

Solution

We are solving the equation:

log(3+x)log(x2)=log(2).\log(3 + x) - \log(x - 2) = \log(2).

Step 1: Apply the logarithmic subtraction rule

Using the property of logarithms: log(a)log(b)=log(ab),\log(a) - \log(b) = \log\left(\frac{a}{b}\right), we rewrite the left-hand side: log(3+xx2)=log(2).\log\left(\frac{3 + x}{x - 2}\right) = \log(2).

Step 2: Remove the logarithms

Since the logarithmic functions are equal, their arguments must also be equal: 3+xx2=2.\frac{3 + x}{x - 2} = 2.

Step 3: Solve for xx

Multiply both sides by x2x - 2 (assuming x20x - 2 \neq 0) to eliminate the fraction: 3+x=2(x2).3 + x = 2(x - 2).

Simplify the right-hand side: 3+x=2x4.3 + x = 2x - 4.

Rearrange terms to isolate xx: 3+4=2xx,3 + 4 = 2x - x, 7=x.7 = x.

Step 4: Check for restrictions

For the logarithms to be defined:

  1. 3+x>0    x>33 + x > 0 \implies x > -3,
  2. x2>0    x>2x - 2 > 0 \implies x > 2.

The solution x=7x = 7 satisfies both conditions.

Final Answer:

x=7.x = 7.


Would you like a detailed breakdown of any step or have questions? Here are some related problems you might consider:

  1. Solve log(x+1)log(x3)=log(5)\log(x+1) - \log(x-3) = \log(5).
  2. Find xx in log(x2)=log(16)\log(x^2) = \log(16).
  3. Solve log3(x+4)log3(x)=1\log_3(x+4) - \log_3(x) = 1.
  4. Solve log(x)+log(2x1)=log(15)\log(x) + \log(2x - 1) = \log(15).
  5. Simplify log(a)log(b)+log(c)\log(a) - \log(b) + \log(c).

Tip: Always check the domain of the logarithmic functions to ensure the solution is valid!

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Math Problem Analysis

Mathematical Concepts

Logarithmic Equations
Logarithmic Properties
Algebra

Formulas

log(a) - log(b) = log(a/b)
log(a) = log(b) implies a = b

Theorems

Logarithmic subtraction rule
Equality of logarithms

Suitable Grade Level

Grades 9-11