Algebra II : Understanding Logarithms

Study concepts, example questions & explanations for Algebra II

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Example Questions

Example Question #1 : Logarithms And Exponents

Solve for :

Round to the nearest hundredth. 

Possible Answers:

Correct answer:

Explanation:

To solve this, you need to set up a logarithm. Our exponent is .  The number of which it is the exponent of  is the base.  This is the logarithm's base.  The value  is the operand of the logarithm. Therefore, we can write an equation:

Now, you cannot do this on your calculator.  Therefore, using the rule for converting logarithms, you need to change:

to...

You can put this into your calculator and get:

, or rounded, 

Example Question #5 : Logarithms And Exponents

Solve for :

Round to the nearest hundredth.

Possible Answers:

Correct answer:

Explanation:

To solve this, you need to set up a logarithm. Our exponent is .  The number of which it is the exponent of  is the base.  This is the logarithm's base.  The value  is the operand of the logarithm. Therefore, we can write an equation:

Now, you cannot do this on your calculator.  Therefore, using the rule for converting logarithms, you need to change:

to...

You can put this into your calculator and get:

, or rounded, 

Example Question #6 : Logarithms And Exponents

Solve for :

Round to the nearest hundredth. 

Possible Answers:

Correct answer:

Explanation:

To solve this, you need to set up a logarithm.  Our exponent is .  The number of which it is the exponent of  is the base.  This is the logarithm's base.  The value  is the operand of the logarithm. Therefore, we can write an equation:

Now, you cannot do this on your calculator.  Therefore, using the rule for converting logarithms, you need to change:

to...

You can put this into your calculator and get:

, or rounded, 

Example Question #7 : Logarithms And Exponents

Write the equation  in logarithmic form.

Possible Answers:

Correct answer:

Explanation:

For logarithmic equations,  can be rewritten as .

In this expression,  is the base of the equation ().  is the exponent () and  is the term (). 

In putting each term in its appropriate spot, the exponential equation can be converted to .

Example Question #8 : Logarithms And Exponents

Solve the following logarithm for :

Possible Answers:

Correct answer:

Explanation:

Solve the following logarithm:

Recall that we can convert logarithms to exponential form via the following:

   

Using this approach, convert the given log to exponential form:

 

Example Question #9 : Logarithms And Exponents

Rewrite the following expression as an exponential expression:

Possible Answers:

Correct answer:

Explanation:

Rewrite the following expression as an exponential expression:

Recall the following property of logs and exponents:

 

Can be rewritten in the following form:

So, taking the log we are given;

We can rewrite it in the form:

So b must be a really huge number!

Example Question #10 : Logarithms And Exponents

Convert the following logarithmic equation to an exponential equation:

Possible Answers:

Correct answer:

Explanation:

Convert the following logarithmic equation to an exponential equation:

Recall the following:

This

Can be rewritten as

So, our given logarithm

Can be rewritten as

Fortunately we don't need to expand, because this woud be a very large number!

Example Question #51 : Logarithms

Rewrite the follwing equation as a logarithm:

Possible Answers:

Correct answer:

Explanation:

Rewrite the follwing equation as a logarithm:

To complete this problem, recall the following relationship:

 can be rewritten as 

So, this:

Is the same thing as this:

Example Question #2961 : Algebra Ii

Simplify:  

Possible Answers:

Correct answer:

Explanation:

When the base  is raised to a certain power, taking the natural log of this whole term will eliminate the exponential and the power can be pulled out as the coefficient.

The answer is:  

Example Question #53 : Logarithms

Solve:  

Possible Answers:

Correct answer:

Explanation:

In order to solve this log, we will need to write 125 in terms of one fifth to a certain power.

Rewrite 125 as an exponent of one-fifth.

According to the log rule,  , the bases will cancel, leaving just the exponent.

The answer is:  

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