Math Problem Statement

For what value of
x is the following true? Give your answer as an integer or a fully reduced fraction.

log ( x + 10 )

log x + log 5 .

Your answer is: x

Solution

To solve for xx in the equation

log(x+10)=log(x)+log(5),\log(x + 10) = \log(x) + \log(5),

we can use the properties of logarithms to simplify and isolate xx.

Step 1: Apply the Product Rule

The right side of the equation can be simplified using the product rule for logarithms, which states that log(a)+log(b)=log(ab)\log(a) + \log(b) = \log(a \cdot b).

log(x)+log(5)=log(5x)\log(x) + \log(5) = \log(5x)

So the equation becomes:

log(x+10)=log(5x)\log(x + 10) = \log(5x)

Step 2: Remove the Logarithms

Since the logs on both sides of the equation are equal, we can set the arguments equal to each other:

x+10=5xx + 10 = 5x

Step 3: Solve for xx

Now, isolate xx by moving all terms involving xx to one side of the equation:

10=5xx10 = 5x - x 10=4x10 = 4x x=104=52x = \frac{10}{4} = \frac{5}{2}

Conclusion

The solution is:

x=52x = \frac{5}{2}


If you have any questions or would like a breakdown of any step, feel free to ask!

Related Questions

  1. How do you solve logarithmic equations with multiple logarithmic terms?
  2. Can you show how to solve log(x2)=2log(x)\log(x^2) = 2 \log(x) without using the product rule?
  3. How does the product rule for logarithms apply to negative values of xx?
  4. What happens if x=5x = -5 in this equation?
  5. Can the same approach be used for equations like log(x+2)=log(x)+log(3)\log(x+2) = \log(x) + \log(3)?

Tip

When dealing with logarithmic equations, look out for properties like the product and quotient rules to simplify expressions before isolating variables.

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Math Problem Analysis

Mathematical Concepts

Logarithms
Logarithmic Equations
Product Rule for Logarithms

Formulas

log(a) + log(b) = log(a * b)
log(a) = log(b) implies a = b

Theorems

Product Rule for Logarithms
Logarithmic Equality Theorem

Suitable Grade Level

Grades 9-11