High School Math : Multiplying and dividing Logarithms

Study concepts, example questions & explanations for High School Math

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Example Questions

Example Question #1 : Multiplying And Dividing Logarithms

Simplify .

Possible Answers:

Correct answer:

Explanation:

Using properties of logs we get:

Example Question #2 : Multiplying And Dividing 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 : Multiplying And Dividing 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 #4 : Multiplying And Dividing 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,

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