High School Math : Simplifying Logarithms

Study concepts, example questions & explanations for High School Math

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Example Questions

Example Question #1 : Simplifying Logarithms

Simplify .

Possible Answers:

Correct answer:

Explanation:

Using properties of logs we get:

Example Question #2 : Simplifying Logarithms

Simplify the following expression: 

Possible Answers:

Correct answer:

Explanation:

Recall the log rule: 

In this particular case,  and . Thus, our answer is .

Example Question #3 : Simplifying Logarithms

Use the properties of logarithms to solve the following equation:

Possible Answers:

No real solutions

Correct answer:

Explanation:

Since the bases of the logs are the same and the logarithms are added, the arguments can be multiplied together. We then simplify the right side of the equation:

The logarithm can be converted to exponential form:

Factor the equation:

Although there are two solutions to the equation, logarithms cannot be negative. Therefore, the only real solution is .

Example Question #1 : Adding And Subtracting Logarithms

Simplify the expression using logarithmic identities.

Possible Answers:

Cannot be simplified

Correct answer:

Explanation:

The logarithm of a fraction is equal to the logarithm of the numerator minus the logarithm of the denominator.

If we encounter two logarithms with the same base, we can likely combine them. In this case, we can use the reverse of the above identity.

Example Question #5 : Simplifying Logarithms

Which of the following represents a simplified form of

Possible Answers:

Correct answer:

Explanation:

The rule for the addition of logarithms is as follows: 

As an application of this,

Example Question #6 : Simplifying Logarithms

Evaluate by hand 

Possible Answers:

Cannot be found by hand

Correct answer:

Explanation:

Using the logarithm rules, exponents within logarithms can be removed and simply multiplied by the remaining logarithm.  This expression can be simplified as 

Example Question #7 : Simplifying Logarithms

Solve for

Possible Answers:

Correct answer:

Explanation:

Use the power reducing theorem:

and

Example Question #8 : Simplifying Logarithms

Which of the following expressions is equivalent to

Possible Answers:

Correct answer:

Explanation:

According to the rule for exponents of logarithms,. As a direct application of this,.

Example Question #9 : Simplifying Logarithms

Simplify the expression below. 

 

Possible Answers:

Correct answer:

Explanation:

Based on the definition of exponents, .

Then, we use the following rule of logarithms: 

Thus, 

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