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Algebra II : Logarithms

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Example Questions

Example Question #38 : Solving Logarithms

Evaluate: $log_{100}10$

Possible Answers:

$\frac{1}{2}$

$\sqrt2$

$\sqrt e$

$\frac{1}{4}$

e^2

Correct answer:

$\frac{1}{2}$

Explanation:

The expression can be rewritten as a fraction.

$log_{100}10 = \frac{log(10)}{log(100)}$

The log based 100 can be rewritten as ten squared.

$\frac{log(10)}{log(100)} = \frac{log(10)}{log(10^2)} = \frac{log(10)}{2log(10)} = \frac{1}{2}$

The answer is: $\frac{1}{2}$

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Example Question #35 : Solving Logarithms

Solve the logs: log(2)+log(4)+log(6)-log(8)

Possible Answers:

3log(2)+2log(3)

log(4)

log(2)+log(3)

log(5)

3log(2)

Correct answer:

log(2)+log(3)

Explanation:

For logs that are added, the inner quantities can be multiplied with each other to be combined as a single log.

For logs that are subtracted, the inner quantities would each be divided instead.

Rewrite the expression:

$log(2)+log(4)+log(6)-log(8) =log( \frac{2(4)(6)}{8})$

= log(6)= log(2)+log(3)

The answer is: log(2)+log(3)

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Example Question #36 : Solving Logarithms

Evaluate: $log(\frac{x}{10})= 2$

Possible Answers:

$\frac{1}{100}$

1000

$\frac{1}{1000}$

100

$\frac{1}{200}$

Correct answer:

1000

Explanation:

Recall that log has a base of ten.

The equation can be rewritten as:

$log_{10}(\frac{x}{10})= 2$

$log_{10}(x)-log_{10}(10) = 2$

$log_{10}(x)-1= 2$

Add 1 on both sides.

$log_{10}(x)-1+1= 2+1$

$log_{10}(x) = 3$

To eliminate the log based 10 on the left, we will need to raise both terms as exponents of base 10.

$10^{log_{10}(x)} = 10^3$

x=1000

The answer is: 1000

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Example Question #41 : Solving Logarithms

Find if $log_{3}(x)=4$ .

Possible Answers:

Correct answer:

Explanation:

First, we start with the full equation:

$log_{3}(x)=4$

Now we can expand the right side of the equation:

$log_{3}(x)=1+1+1+1$

A log of it's own base equals :

$log_{3}(x)=log_{3}(3)+log_{3}(3)+log_{3}(3)+log_{3}(3)$

Now we add the logs on the right side of the equation by multiplying the terms inside the logs:

$log_{3}(x)=log_{3}(3*3*3*3)$

$log_{3}(x)=log_{3}(81)$

x=81

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Example Question #181 : Logarithms

Solve $log_{7}(x-4)=0$

Possible Answers:

Correct answer:

Explanation:

By definition, a logarithm of any base that has the term inside is equal to . So we set that term equal to :

x-4=1

x=5

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Example Question #41 : Solving And Graphing Logarithms

Solve $log_{5}(2x)=1$ .

Possible Answers:

$\frac{2}{5}$

$\frac{5}{2}$

Correct answer:

$\frac{5}{2}$

Explanation:

When a logarithm equals , the equation in the logarithm equals the logarithms base:

2x=5

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

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Example Question #42 : Solving And Graphing Logarithms

Solve $log_{10}(x)=-1$

Possible Answers:

Correct answer:

Explanation:

Rearranging the logarithm so that we exchange an exponent for the log we get:

$10^{-1}=x$

x=.1

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Example Question #43 : Solving And Graphing Logarithms

Solve $log_{8}(2x+4)=1$ .

Possible Answers:

$-\frac{3}{2}$

Correct answer:

Explanation:

First we rearrange the equation, trading the logarithm for an exponent:

8^1=2x+4

And then we solve:

4=2x

2=x

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Example Question #3093 : Algebra Ii

Solve $log_{3}(x+1)+log_{3}(x)=2$ .

Possible Answers:

Correct answer:

Explanation:

The first thing we can do is combine the log terms:

$log_{3}((x+1)x)=2$

Now we can change to exponent form:

3^2=(x+1)x

We can combine terms and set the equation equal to to have a quadratic equation:

x^2+x-6=0

We then solve the equation and get the answers:

and

can't be an answer, because the values inside a log can't be negative, so that leaves us with a single answer of .

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Example Question #3093 : Algebra Ii

Solve log_2 (x + 1) +log_2 (x - 1) = 3 .

Possible Answers:

Correct answer:

Explanation:

The first thing we can do is combine log terms:

log_2((x+1)(x-1))=3

Simplifying the log term gives:

log_2(x^2-1)=3

Now we can change the equation to exponent form:

x^2 - 1 = 2^3

And to solve:

x^2-1=8

x^2=9

x=3, x-3

Here, the solution can't be because the term inside a logarithm can't be negative, so the only solution is .

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Algebra II : Logarithms

Study concepts, example questions & explanations for Algebra II

All Algebra II Resources

Example Questions

Example Question #38 : Solving Logarithms

Example Question #35 : Solving Logarithms

Example Question #36 : Solving Logarithms

Example Question #41 : Solving Logarithms

Example Question #181 : Logarithms

Example Question #41 : Solving And Graphing Logarithms

Example Question #42 : Solving And Graphing Logarithms

Example Question #43 : Solving And Graphing Logarithms

Example Question #3093 : Algebra Ii

Example Question #3093 : Algebra Ii

All Algebra II Resources

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